325 files changed, 325 insertions, 325 deletions

diff --git a/lib/libalias/libalias.3 b/lib/libalias/libalias.3
index 995d965dac584..e8bdefdfc4894 100644
--- a/lib/libalias/libalias.3
+++ b/lib/libalias/libalias.3
@@ -27,7 +27,7 @@
 .\"
 .Dd April 13, 2000
 .Dt LIBALIAS 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm libalias
 .Nd packet aliasing library for masquerading and network address translation
diff --git a/lib/libc/compat-43/creat.2 b/lib/libc/compat-43/creat.2
index 1ec50b0d43473..334fc01de4dce 100644
--- a/lib/libc/compat-43/creat.2
+++ b/lib/libc/compat-43/creat.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 2, 1993
 .Dt CREAT 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm creat
 .Nd create a new file
diff --git a/lib/libc/compat-43/gethostid.3 b/lib/libc/compat-43/gethostid.3
index 156b4256f3024..837cecf9bbae7 100644
--- a/lib/libc/compat-43/gethostid.3
+++ b/lib/libc/compat-43/gethostid.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 2, 1993
 .Dt GETHOSTID 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm gethostid ,
 .Nm sethostid
diff --git a/lib/libc/compat-43/killpg.2 b/lib/libc/compat-43/killpg.2
index 68e5e18f01a9b..c8c218caa4073 100644
--- a/lib/libc/compat-43/killpg.2
+++ b/lib/libc/compat-43/killpg.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 2, 1993
 .Dt KILLPG 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm killpg
 .Nd send signal to a process group
diff --git a/lib/libc/compat-43/setruid.3 b/lib/libc/compat-43/setruid.3
index 3c485276e9a8a..7c87821e66539 100644
--- a/lib/libc/compat-43/setruid.3
+++ b/lib/libc/compat-43/setruid.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 2, 1993
 .Dt SETRUID 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm setruid ,
 .Nm setrgid
diff --git a/lib/libc/compat-43/sigpause.2 b/lib/libc/compat-43/sigpause.2
index 6aa52522cd476..516486eaa18e2 100644
--- a/lib/libc/compat-43/sigpause.2
+++ b/lib/libc/compat-43/sigpause.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 2, 1993
 .Dt SIGPAUSE 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm sigpause
 .Nd atomically release blocked signals and wait for interrupt
diff --git a/lib/libc/compat-43/sigsetmask.2 b/lib/libc/compat-43/sigsetmask.2
index 84dcc5568214a..59944d6061d20 100644
--- a/lib/libc/compat-43/sigsetmask.2
+++ b/lib/libc/compat-43/sigsetmask.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 2, 1993
 .Dt SIGSETMASK 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm sigsetmask ,
 .Nm sigblock
diff --git a/lib/libc/compat-43/sigvec.2 b/lib/libc/compat-43/sigvec.2
index d73fa3f2ef0cf..1e45736803b21 100644
--- a/lib/libc/compat-43/sigvec.2
+++ b/lib/libc/compat-43/sigvec.2
@@ -34,7 +34,7 @@
 .\"
 .Dd April 19, 1994
 .Dt SIGVEC 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm sigvec
 .Nd software signal facilities
diff --git a/lib/libc/gen/alarm.3 b/lib/libc/gen/alarm.3
index a65cd01df5db7..4157f2615ac50 100644
--- a/lib/libc/gen/alarm.3
+++ b/lib/libc/gen/alarm.3
@@ -34,7 +34,7 @@
 .\"
 .Dd April 19, 1994
 .Dt ALARM 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm alarm
 .Nd set signal timer alarm
diff --git a/lib/libc/gen/confstr.3 b/lib/libc/gen/confstr.3
index 6dfd830856df5..1c6d2514fa4f1 100644
--- a/lib/libc/gen/confstr.3
+++ b/lib/libc/gen/confstr.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 18, 2001
 .Dt CONFSTR 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm confstr
 .Nd get string-valued configurable variables
diff --git a/lib/libc/gen/devname.3 b/lib/libc/gen/devname.3
index 2f39c80e9cd17..d7cc940feea5b 100644
--- a/lib/libc/gen/devname.3
+++ b/lib/libc/gen/devname.3
@@ -34,7 +34,7 @@
 .\"
 .Dd April 29, 1995
 .Dt DEVNAME 3
-.Os BSD 4.4
+.Os
 .Sh NAME
 .Nm devname
 .Nd get device name
diff --git a/lib/libc/gen/directory.3 b/lib/libc/gen/directory.3
index 8061d1db4d6ec..e9f3a90ce9a2c 100644
--- a/lib/libc/gen/directory.3
+++ b/lib/libc/gen/directory.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt DIRECTORY 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm opendir ,
 .Nm readdir ,
diff --git a/lib/libc/gen/dladdr.3 b/lib/libc/gen/dladdr.3
index 36c58865f2541..596fc7a9239c4 100644
--- a/lib/libc/gen/dladdr.3
+++ b/lib/libc/gen/dladdr.3
@@ -26,7 +26,7 @@
 .\" $FreeBSD$
 .\"
 .Dd February 5, 1998
-.Os FreeBSD
+.Os
 .Dt DLADDR 3
 .Sh NAME
 .Nm dladdr
diff --git a/lib/libc/gen/dllockinit.3 b/lib/libc/gen/dllockinit.3
index 0e97857dcff0c..9301809b27c03 100644
--- a/lib/libc/gen/dllockinit.3
+++ b/lib/libc/gen/dllockinit.3
@@ -26,7 +26,7 @@
 .\" $FreeBSD$
 .\"
 .Dd July 5, 2000
-.Os FreeBSD
+.Os
 .Dt DLLOCKINIT 3
 .Sh NAME
 .Nm dllockinit
diff --git a/lib/libc/gen/dlopen.3 b/lib/libc/gen/dlopen.3
index a45362de338dc..480d7c3a62938 100644
--- a/lib/libc/gen/dlopen.3
+++ b/lib/libc/gen/dlopen.3
@@ -33,7 +33,7 @@
 .\" $FreeBSD$
 .\"
 .Dd September 24, 1989
-.Os FreeBSD
+.Os
 .Dt DLOPEN 3
 .Sh NAME
 .Nm dlopen , dlsym , dlerror , dlclose
diff --git a/lib/libc/gen/err.3 b/lib/libc/gen/err.3
index f0303c0a785e9..792b5e67f186f 100644
--- a/lib/libc/gen/err.3
+++ b/lib/libc/gen/err.3
@@ -34,7 +34,7 @@
 .\"
 .Dd March 6, 1999
 .Dt ERR 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm err ,
 .Nm verr ,
diff --git a/lib/libc/gen/getbsize.3 b/lib/libc/gen/getbsize.3
index 55b6f3f04563f..828ab2c74d13d 100644
--- a/lib/libc/gen/getbsize.3
+++ b/lib/libc/gen/getbsize.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETBSIZE 3
-.Os BSD 4.4
+.Os
 .Sh NAME
 .Nm getbsize
 .Nd get user block size
diff --git a/lib/libc/gen/getcwd.3 b/lib/libc/gen/getcwd.3
index b9d479037f276..f7c851dddaec5 100644
--- a/lib/libc/gen/getcwd.3
+++ b/lib/libc/gen/getcwd.3
@@ -34,7 +34,7 @@
 .\"
 .Dd November 24, 1997
 .Dt GETCWD 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm getcwd ,
 .Nm getwd
diff --git a/lib/libc/gen/getdiskbyname.3 b/lib/libc/gen/getdiskbyname.3
index b6b86664bf534..a77f77d7deccf 100644
--- a/lib/libc/gen/getdiskbyname.3
+++ b/lib/libc/gen/getdiskbyname.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETDISKBYNAME 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm getdiskbyname
 .Nd get generic disk description by its name
diff --git a/lib/libc/gen/getdomainname.3 b/lib/libc/gen/getdomainname.3
index 60f1f26edde15..4d6f72376655e 100644
--- a/lib/libc/gen/getdomainname.3
+++ b/lib/libc/gen/getdomainname.3
@@ -34,7 +34,7 @@
 .\"
 .Dd May 6, 1994
 .Dt GETDOMAINNAME 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm getdomainname ,
 .Nm setdomainname
diff --git a/lib/libc/gen/getfsent.3 b/lib/libc/gen/getfsent.3
index 82d1ef66cf349..2998246ea9168 100644
--- a/lib/libc/gen/getfsent.3
+++ b/lib/libc/gen/getfsent.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETFSENT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm getfsent ,
 .Nm getfsspec ,
diff --git a/lib/libc/gen/gethostname.3 b/lib/libc/gen/gethostname.3
index ba0bbe3a1f215..605ccc78a2751 100644
--- a/lib/libc/gen/gethostname.3
+++ b/lib/libc/gen/gethostname.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETHOSTNAME 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm gethostname ,
 .Nm sethostname
diff --git a/lib/libc/gen/getobjformat.3 b/lib/libc/gen/getobjformat.3
index 33240c8d4d089..8e282c5dcd67e 100644
--- a/lib/libc/gen/getobjformat.3
+++ b/lib/libc/gen/getobjformat.3
@@ -26,7 +26,7 @@
 .\"
 .Dd September 7, 1998
 .Dt GETOBJFORMAT 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm getobjformat
 .Nd get preferred object file format
diff --git a/lib/libc/gen/getpagesize.3 b/lib/libc/gen/getpagesize.3
index 5fd90df3320a1..8b5e2f7aaf6e6 100644
--- a/lib/libc/gen/getpagesize.3
+++ b/lib/libc/gen/getpagesize.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETPAGESIZE 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm getpagesize
 .Nd get system page size
diff --git a/lib/libc/gen/getttyent.3 b/lib/libc/gen/getttyent.3
index cc108e671892f..88762e10cc8df 100644
--- a/lib/libc/gen/getttyent.3
+++ b/lib/libc/gen/getttyent.3
@@ -34,7 +34,7 @@
 .\"
 .Dd November 17, 1996
 .Dt GETTTYENT 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm getttyent ,
 .Nm getttynam ,
diff --git a/lib/libc/gen/initgroups.3 b/lib/libc/gen/initgroups.3
index 27155fa29a4b5..23756b294a717 100644
--- a/lib/libc/gen/initgroups.3
+++ b/lib/libc/gen/initgroups.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt INITGROUPS 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm initgroups
 .Nd initialize group access list
diff --git a/lib/libc/gen/lockf.3 b/lib/libc/gen/lockf.3
index a7c511de8802c..a199c2fbd8b72 100644
--- a/lib/libc/gen/lockf.3
+++ b/lib/libc/gen/lockf.3
@@ -38,7 +38,7 @@
 .\"
 .Dd December 19, 1997
 .Dt LOCKF 3
-.Os NetBSD 1.4
+.Os
 .Sh NAME
 .Nm lockf
 .Nd record locking on files
diff --git a/lib/libc/gen/msgctl.3 b/lib/libc/gen/msgctl.3
index 56b4f8697415b..3e25f79ffdc77 100644
--- a/lib/libc/gen/msgctl.3
+++ b/lib/libc/gen/msgctl.3
@@ -33,7 +33,7 @@
 .\"/
 .Dd November 24, 1997
 .Dt MSGCTL 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm msgctl
 .Nd message control operations
diff --git a/lib/libc/gen/msgget.3 b/lib/libc/gen/msgget.3
index 6d221415415e8..838e13a955f2a 100644
--- a/lib/libc/gen/msgget.3
+++ b/lib/libc/gen/msgget.3
@@ -33,7 +33,7 @@
 .\"/
 .Dd August 17, 1995
 .Dt MSGGET 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm msgget
 .Nd get message queue
diff --git a/lib/libc/gen/msgrcv.3 b/lib/libc/gen/msgrcv.3
index bf8ccf8c586e5..ed627bde0d6fc 100644
--- a/lib/libc/gen/msgrcv.3
+++ b/lib/libc/gen/msgrcv.3
@@ -33,7 +33,7 @@
 .\"/
 .Dd November 24, 1997
 .Dt MSGRCV 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm msgrcv
 .Nd receive a message from a message queue
diff --git a/lib/libc/gen/msgsnd.3 b/lib/libc/gen/msgsnd.3
index 1feb94bad9b08..ede8ff4a53515 100644
--- a/lib/libc/gen/msgsnd.3
+++ b/lib/libc/gen/msgsnd.3
@@ -33,7 +33,7 @@
 .\"
 .Dd November 24, 1997
 .Dt MSGSND 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm msgsnd
 .Nd send a message to a message queue
diff --git a/lib/libc/gen/nice.3 b/lib/libc/gen/nice.3
index df1291f78afca..1fb7eb2e5c530 100644
--- a/lib/libc/gen/nice.3
+++ b/lib/libc/gen/nice.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt NICE 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm nice
 .Nd set program scheduling priority
diff --git a/lib/libc/gen/nlist.3 b/lib/libc/gen/nlist.3
index 96ba25cc7b603..9597b37791a33 100644
--- a/lib/libc/gen/nlist.3
+++ b/lib/libc/gen/nlist.3
@@ -34,7 +34,7 @@
 .\"
 .Dd April 19, 1994
 .Dt NLIST 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm nlist
 .Nd retrieve symbol table name list from an executable file
diff --git a/lib/libc/gen/pause.3 b/lib/libc/gen/pause.3
index 80d1f9f83e880..8ffd75ccfff86 100644
--- a/lib/libc/gen/pause.3
+++ b/lib/libc/gen/pause.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt PAUSE 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pause
 .Nd stop until signal
diff --git a/lib/libc/gen/psignal.3 b/lib/libc/gen/psignal.3
index 3ea6216e1e6dc..fd8052890760b 100644
--- a/lib/libc/gen/psignal.3
+++ b/lib/libc/gen/psignal.3
@@ -34,7 +34,7 @@
 .\"
 .Dd February 27, 1995
 .Dt PSIGNAL 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm psignal ,
 .Nm strsignal ,
diff --git a/lib/libc/gen/rand48.3 b/lib/libc/gen/rand48.3
index d42461b87ddc7..5386bce710342 100644
--- a/lib/libc/gen/rand48.3
+++ b/lib/libc/gen/rand48.3
@@ -14,7 +14,7 @@
 .\"
 .Dd October 8, 1993
 .Dt RAND48 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm drand48 ,
 .Nm erand48 ,
diff --git a/lib/libc/gen/scandir.3 b/lib/libc/gen/scandir.3
index 3f6907889874a..0502bd26ab8ba 100644
--- a/lib/libc/gen/scandir.3
+++ b/lib/libc/gen/scandir.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt SCANDIR 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm scandir ,
 .Nm alphasort
diff --git a/lib/libc/gen/setjmp.3 b/lib/libc/gen/setjmp.3
index 1c4800c2d3bbf..29c2a9b95ef14 100644
--- a/lib/libc/gen/setjmp.3
+++ b/lib/libc/gen/setjmp.3
@@ -38,7 +38,7 @@
 .\"
 .Dd June 4, 1993
 .Dt SETJMP 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm sigsetjmp ,
 .Nm siglongjmp ,
diff --git a/lib/libc/gen/setproctitle.3 b/lib/libc/gen/setproctitle.3
index 15538d52f825e..a09d539ecee2d 100644
--- a/lib/libc/gen/setproctitle.3
+++ b/lib/libc/gen/setproctitle.3
@@ -21,7 +21,7 @@
 .\"
 .\" The following requests are required for all man pages.
 .Dd December 16, 1995
-.Os FreeBSD
+.Os
 .Dt SETPROCTITLE 3
 .Sh NAME
 .Nm setproctitle
diff --git a/lib/libc/gen/siginterrupt.3 b/lib/libc/gen/siginterrupt.3
index 102c04e93b1e3..26672520e8976 100644
--- a/lib/libc/gen/siginterrupt.3
+++ b/lib/libc/gen/siginterrupt.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt SIGINTERRUPT 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm siginterrupt
 .Nd allow signals to interrupt system calls
diff --git a/lib/libc/gen/signal.3 b/lib/libc/gen/signal.3
index 06abdb43b71d3..392074b08e4d4 100644
--- a/lib/libc/gen/signal.3
+++ b/lib/libc/gen/signal.3
@@ -34,7 +34,7 @@
 .\"
 .Dd April 19, 1994
 .Dt SIGNAL 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm signal
 .Nd simplified software signal facilities
diff --git a/lib/libc/gen/stringlist.3 b/lib/libc/gen/stringlist.3
index bd5e0705ae924..6708055af7d8e 100644
--- a/lib/libc/gen/stringlist.3
+++ b/lib/libc/gen/stringlist.3
@@ -36,7 +36,7 @@
 .\" $FreeBSD$
 .\"
 .Dd February 24, 1997
-.Os NetBSD 1.3
+.Os
 .Dt STRINGLIST 3
 .Sh NAME
 .Nm stringlist ,
diff --git a/lib/libc/gen/sysconf.3 b/lib/libc/gen/sysconf.3
index bcd4b38027ee3..65bd8260ec003 100644
--- a/lib/libc/gen/sysconf.3
+++ b/lib/libc/gen/sysconf.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 18, 2001
 .Dt SYSCONF 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm sysconf
 .Nd get configurable system variables
diff --git a/lib/libc/gen/syslog.3 b/lib/libc/gen/syslog.3
index 7513d60181913..18dd3cb96504d 100644
--- a/lib/libc/gen/syslog.3
+++ b/lib/libc/gen/syslog.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt SYSLOG 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm syslog ,
 .Nm vsyslog ,
diff --git a/lib/libc/gen/time.3 b/lib/libc/gen/time.3
index 4a27f6fd82cfa..1293e02d3b012 100644
--- a/lib/libc/gen/time.3
+++ b/lib/libc/gen/time.3
@@ -38,7 +38,7 @@
 .\"
 .Dd June 4, 1993
 .Dt TIME 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm time
 .Nd get time of day
diff --git a/lib/libc/gen/times.3 b/lib/libc/gen/times.3
index 85a33f7b04e95..9f278a4552527 100644
--- a/lib/libc/gen/times.3
+++ b/lib/libc/gen/times.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt TIMES 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm times
 .Nd process times
diff --git a/lib/libc/gen/ualarm.3 b/lib/libc/gen/ualarm.3
index 3e53f048a5983..137212e7f5764 100644
--- a/lib/libc/gen/ualarm.3
+++ b/lib/libc/gen/ualarm.3
@@ -34,7 +34,7 @@
 .\"
 .Dd April 19, 1994
 .Dt UALARM 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm ualarm
 .Nd schedule signal after specified time
diff --git a/lib/libc/gen/usleep.3 b/lib/libc/gen/usleep.3
index b47ea0145fb59..ae89133ff2cb6 100644
--- a/lib/libc/gen/usleep.3
+++ b/lib/libc/gen/usleep.3
@@ -34,7 +34,7 @@
 .\"
 .Dd February 13, 1998
 .Dt USLEEP 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm usleep
 .Nd suspend process execution for an interval measured in microseconds
diff --git a/lib/libc/gen/utime.3 b/lib/libc/gen/utime.3
index e50389824b0c8..87fa93cdb3439 100644
--- a/lib/libc/gen/utime.3
+++ b/lib/libc/gen/utime.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt UTIME 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm utime
 .Nd set file times
diff --git a/lib/libc/gen/valloc.3 b/lib/libc/gen/valloc.3
index a7af23f1e4230..00e4beb346264 100644
--- a/lib/libc/gen/valloc.3
+++ b/lib/libc/gen/valloc.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt VALLOC 3
-.Os BSD 3
+.Os
 .Sh NAME
 .Nm valloc
 .Nd aligned memory allocation function
diff --git a/lib/libc/gmon/moncontrol.3 b/lib/libc/gmon/moncontrol.3
index f0c925475081d..127382463851c 100644
--- a/lib/libc/gmon/moncontrol.3
+++ b/lib/libc/gmon/moncontrol.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt MONCONTROL 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm moncontrol ,
 .Nm monstartup
diff --git a/lib/libc/i386/sys/i386_get_ldt.2 b/lib/libc/i386/sys/i386_get_ldt.2
index d6743c4e3a34b..c1e9584f34aea 100644
--- a/lib/libc/i386/sys/i386_get_ldt.2
+++ b/lib/libc/i386/sys/i386_get_ldt.2
@@ -34,7 +34,7 @@
 .\"
 .Dd September 20, 1993
 .Dt I386_GET_LDT 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm i386_get_ldt ,
 .Nm i386_set_ldt
diff --git a/lib/libc/net/byteorder.3 b/lib/libc/net/byteorder.3
index a38ba8205ef7b..0785911aed893 100644
--- a/lib/libc/net/byteorder.3
+++ b/lib/libc/net/byteorder.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt BYTEORDER 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm htonl ,
 .Nm htons ,
diff --git a/lib/libc/net/ethers.3 b/lib/libc/net/ethers.3
index 31aa7d776b9d3..a1dc7a1289757 100644
--- a/lib/libc/net/ethers.3
+++ b/lib/libc/net/ethers.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 12, 1995
 .Dt ETHERS 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm ethers ,
 .Nm ether_line ,
diff --git a/lib/libc/net/gethostbyname.3 b/lib/libc/net/gethostbyname.3
index 495c512a0d60a..0c3772e9e26d4 100644
--- a/lib/libc/net/gethostbyname.3
+++ b/lib/libc/net/gethostbyname.3
@@ -34,7 +34,7 @@
 .\"
 .Dd May 25, 1995
 .Dt GETHOSTBYNAME 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm gethostbyname ,
 .Nm gethostbyname2 ,
diff --git a/lib/libc/net/getnetent.3 b/lib/libc/net/getnetent.3
index de3e9df2dc2b5..92e4970486033 100644
--- a/lib/libc/net/getnetent.3
+++ b/lib/libc/net/getnetent.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETNETENT 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm getnetent ,
 .Nm getnetbyaddr ,
diff --git a/lib/libc/net/getprotoent.3 b/lib/libc/net/getprotoent.3
index 22dba9ccc251b..a24d995bc1700 100644
--- a/lib/libc/net/getprotoent.3
+++ b/lib/libc/net/getprotoent.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETPROTOENT 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm getprotoent ,
 .Nm getprotobynumber ,
diff --git a/lib/libc/net/getservent.3 b/lib/libc/net/getservent.3
index 06b2d5044be23..e1569d455252d 100644
--- a/lib/libc/net/getservent.3
+++ b/lib/libc/net/getservent.3
@@ -34,7 +34,7 @@
 .\"
 .Dd July 9, 1995
 .Dt GETSERVENT 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm getservent ,
 .Nm getservbyport ,
diff --git a/lib/libc/net/inet.3 b/lib/libc/net/inet.3
index 29aa805323ed6..99e779178c211 100644
--- a/lib/libc/net/inet.3
+++ b/lib/libc/net/inet.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 17, 1996
 .Dt INET 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm inet_aton ,
 .Nm inet_addr ,
diff --git a/lib/libc/net/linkaddr.3 b/lib/libc/net/linkaddr.3
index 9dd9e2edb1871..23932cbac534c 100644
--- a/lib/libc/net/linkaddr.3
+++ b/lib/libc/net/linkaddr.3
@@ -37,7 +37,7 @@
 .\"
 .Dd June 17, 1996
 .Dt LINK_ADDR 3
-.Os BSD 4.4
+.Os
 .Sh NAME
 .Nm link_addr ,
 .Nm link_ntoa
diff --git a/lib/libc/net/ns.3 b/lib/libc/net/ns.3
index 0376d90475207..4d545e3993af9 100644
--- a/lib/libc/net/ns.3
+++ b/lib/libc/net/ns.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt NS 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm ns_addr ,
 .Nm ns_ntoa
diff --git a/lib/libc/net/rcmd.3 b/lib/libc/net/rcmd.3
index 899bd9e55d757..abc601742036f 100644
--- a/lib/libc/net/rcmd.3
+++ b/lib/libc/net/rcmd.3
@@ -34,7 +34,7 @@
 .\"
 .Dd March 3, 2000
 .Dt RCMD 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm rcmd ,
 .Nm rresvport ,
diff --git a/lib/libc/net/resolver.3 b/lib/libc/net/resolver.3
index 07d6bfad51fcb..4870992c334c3 100644
--- a/lib/libc/net/resolver.3
+++ b/lib/libc/net/resolver.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt RESOLVER 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm res_query ,
 .Nm res_search ,
diff --git a/lib/libc/posix1e/acl.3 b/lib/libc/posix1e/acl.3
index 0e14b78ff1823..39822b8c33e70 100644
--- a/lib/libc/posix1e/acl.3
+++ b/lib/libc/posix1e/acl.3
@@ -27,7 +27,7 @@
 .\"
 .Dd January 28, 2000
 .Dt ACL 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm acl
 .Nd introduction to the POSIX.1e ACL security API
diff --git a/lib/libc/posix1e/acl_delete.3 b/lib/libc/posix1e/acl_delete.3
index b7b580fb03099..2aa3f15ff01fe 100644
--- a/lib/libc/posix1e/acl_delete.3
+++ b/lib/libc/posix1e/acl_delete.3
@@ -27,7 +27,7 @@
 .\"
 .Dd January 28, 2000
 .Dt ACL_DELETE 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm acl_delete_def_file ,
 .Nm acl_delete_fd_np ,
diff --git a/lib/libc/posix1e/acl_dup.3 b/lib/libc/posix1e/acl_dup.3
index 813860ba79b0b..b08b2bad1c59b 100644
--- a/lib/libc/posix1e/acl_dup.3
+++ b/lib/libc/posix1e/acl_dup.3
@@ -27,7 +27,7 @@
 .\"
 .Dd January 28, 2000
 .Dt ACL_DUP 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm acl_dup
 .Nd duplicate an ACL
diff --git a/lib/libc/posix1e/acl_free.3 b/lib/libc/posix1e/acl_free.3
index 6e9a32a9711b2..f45c6b38e5fe2 100644
--- a/lib/libc/posix1e/acl_free.3
+++ b/lib/libc/posix1e/acl_free.3
@@ -27,7 +27,7 @@
 .\"
 .Dd January 28, 2000
 .Dt ACL_FREE 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm acl_free
 .Nd free ACL working state
diff --git a/lib/libc/posix1e/acl_from_text.3 b/lib/libc/posix1e/acl_from_text.3
index b07e133f04fef..578e3f7a304cd 100644
--- a/lib/libc/posix1e/acl_from_text.3
+++ b/lib/libc/posix1e/acl_from_text.3
@@ -27,7 +27,7 @@
 .\"
 .Dd January 28, 2000
 .Dt ACL_FROM_TEXT 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm acl_from_text
 .Nd create an ACL from text
diff --git a/lib/libc/posix1e/acl_get.3 b/lib/libc/posix1e/acl_get.3
index d0dbab19ff051..ee8ab54326b0a 100644
--- a/lib/libc/posix1e/acl_get.3
+++ b/lib/libc/posix1e/acl_get.3
@@ -27,7 +27,7 @@
 .\"
 .Dd January 28, 2000
 .Dt ACL_GET 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm acl_get_fd ,
 .Nm acl_get_fd_np ,
diff --git a/lib/libc/posix1e/acl_init.3 b/lib/libc/posix1e/acl_init.3
index f3c3649142573..cebf006def177 100644
--- a/lib/libc/posix1e/acl_init.3
+++ b/lib/libc/posix1e/acl_init.3
@@ -27,7 +27,7 @@
 .\"
 .Dd January 28, 2000
 .Dt ACL_INIT 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm acl_init
 .Nd initialize ACL working storage
diff --git a/lib/libc/posix1e/acl_set.3 b/lib/libc/posix1e/acl_set.3
index 0190e6f7a0943..12abb92000f16 100644
--- a/lib/libc/posix1e/acl_set.3
+++ b/lib/libc/posix1e/acl_set.3
@@ -27,7 +27,7 @@
 .\"
 .Dd January 28, 2000
 .Dt ACL_SET 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm acl_set_fd ,
 .Nm acl_set_fd_np ,
diff --git a/lib/libc/posix1e/acl_to_text.3 b/lib/libc/posix1e/acl_to_text.3
index e11c45c53320f..b28fd5952a22f 100644
--- a/lib/libc/posix1e/acl_to_text.3
+++ b/lib/libc/posix1e/acl_to_text.3
@@ -27,7 +27,7 @@
 .\"
 .Dd January 28, 2000
 .Dt ACL_TO_TEXT 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm acl_to_text
 .Nd convert an ACL to text
diff --git a/lib/libc/posix1e/acl_valid.3 b/lib/libc/posix1e/acl_valid.3
index b73e1dec4f55e..1418d3c22a312 100644
--- a/lib/libc/posix1e/acl_valid.3
+++ b/lib/libc/posix1e/acl_valid.3
@@ -27,7 +27,7 @@
 .\"
 .Dd January 28, 2000
 .Dt ACL_VALID 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm acl_valid ,
 .Nm acl_valid_fd_np ,
diff --git a/lib/libc/posix1e/cap.3 b/lib/libc/posix1e/cap.3
index b47c186ac8290..26d977e1ab658 100644
--- a/lib/libc/posix1e/cap.3
+++ b/lib/libc/posix1e/cap.3
@@ -29,7 +29,7 @@
 .\"
 .Dd April 1, 2000
 .Dt CAP 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm cap
 .Nd introduction to the POSIX.1e Capability security API
diff --git a/lib/libc/posix1e/cap_clear.3 b/lib/libc/posix1e/cap_clear.3
index aafd1bd540e38..97c7958f2f7db 100644
--- a/lib/libc/posix1e/cap_clear.3
+++ b/lib/libc/posix1e/cap_clear.3
@@ -29,7 +29,7 @@
 .\"
 .Dd April 1, 2000
 .Dt CAP_CLEAR 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm cap_clear
 .Nd initialize a capability state in working store
diff --git a/lib/libc/posix1e/cap_dup.3 b/lib/libc/posix1e/cap_dup.3
index 816ca0aa63547..0f29656216f7e 100644
--- a/lib/libc/posix1e/cap_dup.3
+++ b/lib/libc/posix1e/cap_dup.3
@@ -29,7 +29,7 @@
 .\"
 .Dd April 1, 2000
 .Dt CAP_DUP 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm cap_dup
 .Nd duplicate a capability state in working storage
diff --git a/lib/libc/posix1e/cap_free.3 b/lib/libc/posix1e/cap_free.3
index 994cd224c48c9..03a62d4184f51 100644
--- a/lib/libc/posix1e/cap_free.3
+++ b/lib/libc/posix1e/cap_free.3
@@ -29,7 +29,7 @@
 .\"
 .Dd April 1, 2000
 .Dt CAP_FREE 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm cap_free
 .Nd "release memory allocated to a capability state in working storage"
diff --git a/lib/libc/posix1e/cap_from_text.3 b/lib/libc/posix1e/cap_from_text.3
index 14faa8de4155e..1af929254fb17 100644
--- a/lib/libc/posix1e/cap_from_text.3
+++ b/lib/libc/posix1e/cap_from_text.3
@@ -27,7 +27,7 @@
 .\"
 .Dd September 18, 2000
 .Dt CAP_FROM_TEXT 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm cap_from_text
 .Nd convert text to a capability state in working store
diff --git a/lib/libc/posix1e/cap_get_flag.3 b/lib/libc/posix1e/cap_get_flag.3
index c16496299e421..beb3f6ef3e9c1 100644
--- a/lib/libc/posix1e/cap_get_flag.3
+++ b/lib/libc/posix1e/cap_get_flag.3
@@ -29,7 +29,7 @@
 .\"
 .Dd April 1, 2000
 .Dt CAP_GET_FLAG 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm cap_get_flag
 .Nd get the value of a capability flag
diff --git a/lib/libc/posix1e/cap_get_proc.3 b/lib/libc/posix1e/cap_get_proc.3
index b546b12b72865..67ff18514b92d 100644
--- a/lib/libc/posix1e/cap_get_proc.3
+++ b/lib/libc/posix1e/cap_get_proc.3
@@ -29,7 +29,7 @@
 .\"
 .Dd April 1, 2000
 .Dt CAP_GET_PROC 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm cap_get_proc
 .Nd obtain the current process capability state
diff --git a/lib/libc/posix1e/cap_init.3 b/lib/libc/posix1e/cap_init.3
index e9a82633e2bba..7705bc541501f 100644
--- a/lib/libc/posix1e/cap_init.3
+++ b/lib/libc/posix1e/cap_init.3
@@ -29,7 +29,7 @@
 .\"
 .Dd April 1, 2000
 .Dt CAP_INIT 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm cap_init
 .Nd allocate and initialize a capability state in working storage
diff --git a/lib/libc/posix1e/cap_set_flag.3 b/lib/libc/posix1e/cap_set_flag.3
index a9450b266811a..641439a8cc641 100644
--- a/lib/libc/posix1e/cap_set_flag.3
+++ b/lib/libc/posix1e/cap_set_flag.3
@@ -29,7 +29,7 @@
 .\"
 .Dd April 1, 2000
 .Dt CAP_SET_FLAG 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm cap_set_flag
 .Nd set the value of a capability flag
diff --git a/lib/libc/posix1e/cap_set_proc.3 b/lib/libc/posix1e/cap_set_proc.3
index 9304b1c694777..b0b78b885a5cc 100644
--- a/lib/libc/posix1e/cap_set_proc.3
+++ b/lib/libc/posix1e/cap_set_proc.3
@@ -29,7 +29,7 @@
 .\"
 .Dd April 1, 2000
 .Dt CAP_SET_PROC 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm cap_set_proc
 .Nd set the process capability state
diff --git a/lib/libc/posix1e/cap_to_text.3 b/lib/libc/posix1e/cap_to_text.3
index 7dfa65bd6f88c..22feeff8fa8e5 100644
--- a/lib/libc/posix1e/cap_to_text.3
+++ b/lib/libc/posix1e/cap_to_text.3
@@ -27,7 +27,7 @@
 .\"
 .Dd September 18, 2000
 .Dt CAP_TO_TEXT 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm cap_to_text
 .Nd convert a capability state in working storage to text
diff --git a/lib/libc/posix1e/posix1e.3 b/lib/libc/posix1e/posix1e.3
index 86aef66e86f6e..05304f8e10b0a 100644
--- a/lib/libc/posix1e/posix1e.3
+++ b/lib/libc/posix1e/posix1e.3
@@ -27,7 +27,7 @@
 .\"
 .Dd January 17, 2000
 .Dt POSIX1E 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm posix1e
 .Nd introduction to the POSIX.1e security API
diff --git a/lib/libc/stdio/setbuf.3 b/lib/libc/stdio/setbuf.3
index e9fa07972b6f7..28451580f45c8 100644
--- a/lib/libc/stdio/setbuf.3
+++ b/lib/libc/stdio/setbuf.3
@@ -38,7 +38,7 @@
 .\"
 .Dd June 4, 1993
 .Dt SETBUF 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm setbuf ,
 .Nm setbuffer ,
diff --git a/lib/libc/stdio/stdio.3 b/lib/libc/stdio/stdio.3
index 10d79ba8d6e7e..c7dc30da3cf5f 100644
--- a/lib/libc/stdio/stdio.3
+++ b/lib/libc/stdio/stdio.3
@@ -34,7 +34,7 @@
 .\"
 .Dd April 19, 1994
 .Dt STDIO 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm stdio
 .Nd standard input/output library functions
diff --git a/lib/libc/stdlib/alloca.3 b/lib/libc/stdlib/alloca.3
index 0480a0ba75940..d7b48a0801e93 100644
--- a/lib/libc/stdlib/alloca.3
+++ b/lib/libc/stdlib/alloca.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt ALLOCA 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm alloca
 .Nd memory allocator
diff --git a/lib/libc/stdlib/getopt.3 b/lib/libc/stdlib/getopt.3
index d9d69c1411d79..70857b9a960f7 100644
--- a/lib/libc/stdlib/getopt.3
+++ b/lib/libc/stdlib/getopt.3
@@ -34,7 +34,7 @@
 .\"
 .Dd April 27, 1995
 .Dt GETOPT 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm getopt
 .Nd get option character from command line argument list
diff --git a/lib/libc/stdlib/malloc.3 b/lib/libc/stdlib/malloc.3
index 3d6b7ed4a99fc..f49604d2a8dbb 100644
--- a/lib/libc/stdlib/malloc.3
+++ b/lib/libc/stdlib/malloc.3
@@ -38,7 +38,7 @@
 .\"
 .Dd August 27, 1996
 .Dt MALLOC 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm malloc , calloc , realloc , free , reallocf
 .Nd general purpose memory allocation functions
diff --git a/lib/libc/stdlib/memory.3 b/lib/libc/stdlib/memory.3
index 34fae3f42eea3..79c315eb34079 100644
--- a/lib/libc/stdlib/memory.3
+++ b/lib/libc/stdlib/memory.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt MEMORY 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm malloc ,
 .Nm free ,
diff --git a/lib/libc/stdlib/random.3 b/lib/libc/stdlib/random.3
index e673f8a59edc5..a17c1b73742aa 100644
--- a/lib/libc/stdlib/random.3
+++ b/lib/libc/stdlib/random.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt RANDOM 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm random ,
 .Nm srandom ,
diff --git a/lib/libc/stdtime/ctime.3 b/lib/libc/stdtime/ctime.3
index 94f0622515fd1..e3de91bfa5577 100644
--- a/lib/libc/stdtime/ctime.3
+++ b/lib/libc/stdtime/ctime.3
@@ -36,7 +36,7 @@
 .\"
 .Dd January 2, 1999
 .Dt CTIME 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm asctime ,
 .Nm asctime_r ,
diff --git a/lib/libc/stdtime/tzfile.5 b/lib/libc/stdtime/tzfile.5
index e29d4d73350e5..cc7e659660606 100644
--- a/lib/libc/stdtime/tzfile.5
+++ b/lib/libc/stdtime/tzfile.5
@@ -1,7 +1,7 @@
 .\" $FreeBSD$
 .Dd September 13, 1994
 .Dt TZFILE 5
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm tzfile
 .Nd timezone information
diff --git a/lib/libc/string/bcmp.3 b/lib/libc/string/bcmp.3
index 4300d1f930b5f..0e743a0b871e4 100644
--- a/lib/libc/string/bcmp.3
+++ b/lib/libc/string/bcmp.3
@@ -36,7 +36,7 @@
 .\"
 .Dd June 4, 1993
 .Dt BCMP 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm bcmp
 .Nd compare byte string
diff --git a/lib/libc/string/bcopy.3 b/lib/libc/string/bcopy.3
index 54afedf4a196e..7f3fa4758597c 100644
--- a/lib/libc/string/bcopy.3
+++ b/lib/libc/string/bcopy.3
@@ -37,7 +37,7 @@
 .\"
 .Dd June 4, 1993
 .Dt BCOPY 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm bcopy
 .Nd copy byte string
diff --git a/lib/libc/string/bzero.3 b/lib/libc/string/bzero.3
index ca488fc9423da..1f4fbc56bb8aa 100644
--- a/lib/libc/string/bzero.3
+++ b/lib/libc/string/bzero.3
@@ -37,7 +37,7 @@
 .\"
 .Dd June 4, 1993
 .Dt BZERO 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm bzero
 .Nd write zeroes to a byte string
diff --git a/lib/libc/string/strcpy.3 b/lib/libc/string/strcpy.3
index cb38dce6b8fe1..6f221af9f6041 100644
--- a/lib/libc/string/strcpy.3
+++ b/lib/libc/string/strcpy.3
@@ -38,7 +38,7 @@
 .\"
 .Dd June 4, 1993
 .Dt STRCPY 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm strcpy
 .Nd copy strings
diff --git a/lib/libc/string/strerror.3 b/lib/libc/string/strerror.3
index 1799c1c6a8b24..e714ff24b4c32 100644
--- a/lib/libc/string/strerror.3
+++ b/lib/libc/string/strerror.3
@@ -38,7 +38,7 @@
 .\"
 .Dd June 9, 1993
 .Dt STRERROR 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm perror ,
 .Nm strerror ,
diff --git a/lib/libc/string/string.3 b/lib/libc/string/string.3
index 6a3457c12b9b1..e822f7f841be6 100644
--- a/lib/libc/string/string.3
+++ b/lib/libc/string/string.3
@@ -36,7 +36,7 @@
 .\"
 .Dd December 11, 1993
 .Dt STRING 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm strcat ,
 .Nm strncat ,
diff --git a/lib/libc/string/strtok.3 b/lib/libc/string/strtok.3
index 297c982ec6c2d..77837d2db5e77 100644
--- a/lib/libc/string/strtok.3
+++ b/lib/libc/string/strtok.3
@@ -52,7 +52,7 @@
 .\"
 .Dd November 27, 1998
 .Dt STRTOK 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm strtok , strtok_r
 .Nd string tokens
diff --git a/lib/libc/sys/_exit.2 b/lib/libc/sys/_exit.2
index 770672b4fa1d4..50096e6dc4bae 100644
--- a/lib/libc/sys/_exit.2
+++ b/lib/libc/sys/_exit.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt EXIT 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm _exit
 .Nd terminate the calling process
diff --git a/lib/libc/sys/accept.2 b/lib/libc/sys/accept.2
index 9e6b5fdc6b683..968f4cecbd7df 100644
--- a/lib/libc/sys/accept.2
+++ b/lib/libc/sys/accept.2
@@ -34,7 +34,7 @@
 .\"
 .Dd December 11, 1993
 .Dt ACCEPT 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm accept
 .Nd accept a connection on a socket
diff --git a/lib/libc/sys/access.2 b/lib/libc/sys/access.2
index 0de57e1cfbfdf..e37d06918dc2d 100644
--- a/lib/libc/sys/access.2
+++ b/lib/libc/sys/access.2
@@ -34,7 +34,7 @@
 .\"
 .Dd April 1, 1994
 .Dt ACCESS 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm access
 .Nd check access permissions of a file or pathname
diff --git a/lib/libc/sys/acct.2 b/lib/libc/sys/acct.2
index 0dce177846fd4..7b1c6c22fb818 100644
--- a/lib/libc/sys/acct.2
+++ b/lib/libc/sys/acct.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt ACCT 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm acct
 .Nd enable or disable process accounting
diff --git a/lib/libc/sys/adjtime.2 b/lib/libc/sys/adjtime.2
index a5e164748465b..a6ddd8ce6c85c 100644
--- a/lib/libc/sys/adjtime.2
+++ b/lib/libc/sys/adjtime.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt ADJTIME 2
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm adjtime
 .Nd "correct the time to allow synchronization of the system clock"
diff --git a/lib/libc/sys/bind.2 b/lib/libc/sys/bind.2
index d13b2987b9bd0..ac8337ed61a8d 100644
--- a/lib/libc/sys/bind.2
+++ b/lib/libc/sys/bind.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt BIND 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm bind
 .Nd assign a local protocol address to a socket
diff --git a/lib/libc/sys/brk.2 b/lib/libc/sys/brk.2
index 7f40e3417a279..97b2915c5af36 100644
--- a/lib/libc/sys/brk.2
+++ b/lib/libc/sys/brk.2
@@ -34,7 +34,7 @@
 .\"
 .Dd May 1, 1995
 .Dt BRK 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm brk ,
 .Nm sbrk
diff --git a/lib/libc/sys/chdir.2 b/lib/libc/sys/chdir.2
index d6ca532155497..7a9c716128de2 100644
--- a/lib/libc/sys/chdir.2
+++ b/lib/libc/sys/chdir.2
@@ -34,7 +34,7 @@
 .\"
 .Dd December 11, 1993
 .Dt CHDIR 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm chdir ,
 .Nm fchdir
diff --git a/lib/libc/sys/chmod.2 b/lib/libc/sys/chmod.2
index 61f1b36a40fc2..6a3120f34cd4a 100644
--- a/lib/libc/sys/chmod.2
+++ b/lib/libc/sys/chmod.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt CHMOD 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm chmod ,
 .Nm fchmod ,
diff --git a/lib/libc/sys/chown.2 b/lib/libc/sys/chown.2
index 1ae9bf9f2b385..e049ad539a080 100644
--- a/lib/libc/sys/chown.2
+++ b/lib/libc/sys/chown.2
@@ -34,7 +34,7 @@
 .\"
 .Dd April 19, 1994
 .Dt CHOWN 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm chown ,
 .Nm fchown ,
diff --git a/lib/libc/sys/chroot.2 b/lib/libc/sys/chroot.2
index 6d9f7642af8c7..db7336cfb4fa0 100644
--- a/lib/libc/sys/chroot.2
+++ b/lib/libc/sys/chroot.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt CHROOT 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm chroot
 .Nd change root directory
diff --git a/lib/libc/sys/clock_gettime.2 b/lib/libc/sys/clock_gettime.2
index 956168a8ddf4d..24ead3501b325 100644
--- a/lib/libc/sys/clock_gettime.2
+++ b/lib/libc/sys/clock_gettime.2
@@ -34,7 +34,7 @@
 .\"
 .Dd May 8, 1997
 .Dt CLOCK_GETTIME 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm clock_gettime ,
 .Nm clock_settime ,
diff --git a/lib/libc/sys/close.2 b/lib/libc/sys/close.2
index e0ebcc11bdb8a..18ebe3c2f0004 100644
--- a/lib/libc/sys/close.2
+++ b/lib/libc/sys/close.2
@@ -34,7 +34,7 @@
 .\"
 .Dd April 19, 1994
 .Dt CLOSE 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm close
 .Nd delete a descriptor
diff --git a/lib/libc/sys/connect.2 b/lib/libc/sys/connect.2
index 8b023ab4cfb22..7a8a59d523dd4 100644
--- a/lib/libc/sys/connect.2
+++ b/lib/libc/sys/connect.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt CONNECT 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm connect
 .Nd initiate a connection on a socket
diff --git a/lib/libc/sys/dup.2 b/lib/libc/sys/dup.2
index 9329cbc3577d5..d64ee65864223 100644
--- a/lib/libc/sys/dup.2
+++ b/lib/libc/sys/dup.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt DUP 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm dup ,
 .Nm dup2
diff --git a/lib/libc/sys/execve.2 b/lib/libc/sys/execve.2
index dd09ca6c2d53e..85531f85db325 100644
--- a/lib/libc/sys/execve.2
+++ b/lib/libc/sys/execve.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 1, 1994
 .Dt EXECVE 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm execve
 .Nd execute a file
diff --git a/lib/libc/sys/fcntl.2 b/lib/libc/sys/fcntl.2
index ecd6221617e6e..9c2a25bdc80eb 100644
--- a/lib/libc/sys/fcntl.2
+++ b/lib/libc/sys/fcntl.2
@@ -34,7 +34,7 @@
 .\"
 .Dd January 12, 1994
 .Dt FCNTL 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm fcntl
 .Nd file control
diff --git a/lib/libc/sys/flock.2 b/lib/libc/sys/flock.2
index 73fc8e2c7e51f..49ecd4d56d41e 100644
--- a/lib/libc/sys/flock.2
+++ b/lib/libc/sys/flock.2
@@ -34,7 +34,7 @@
 .\"
 .Dd December 11, 1993
 .Dt FLOCK 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm flock
 .Nd "apply or remove an advisory lock on an open file"
diff --git a/lib/libc/sys/fork.2 b/lib/libc/sys/fork.2
index ba948731dd1b5..047e5a98ff156 100644
--- a/lib/libc/sys/fork.2
+++ b/lib/libc/sys/fork.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt FORK 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm fork
 .Nd create a new process
diff --git a/lib/libc/sys/fsync.2 b/lib/libc/sys/fsync.2
index a2f75bb2cbdb4..f689c30b6417f 100644
--- a/lib/libc/sys/fsync.2
+++ b/lib/libc/sys/fsync.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt FSYNC 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm fsync
 .Nd "synchronise changes to a file"
diff --git a/lib/libc/sys/getdtablesize.2 b/lib/libc/sys/getdtablesize.2
index 0254456d9917e..28344ac430fd6 100644
--- a/lib/libc/sys/getdtablesize.2
+++ b/lib/libc/sys/getdtablesize.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETDTABLESIZE 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm getdtablesize
 .Nd get descriptor table size
diff --git a/lib/libc/sys/getgid.2 b/lib/libc/sys/getgid.2
index aaaf72b0919e7..3e1a1486440f5 100644
--- a/lib/libc/sys/getgid.2
+++ b/lib/libc/sys/getgid.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETGID 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm getgid ,
 .Nm getegid
diff --git a/lib/libc/sys/getgroups.2 b/lib/libc/sys/getgroups.2
index 3ae52425a42b6..6527e801b630a 100644
--- a/lib/libc/sys/getgroups.2
+++ b/lib/libc/sys/getgroups.2
@@ -34,7 +34,7 @@
 .\"
 .Dd March 5, 1999
 .Dt GETGROUPS 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm getgroups
 .Nd get group access list
diff --git a/lib/libc/sys/getitimer.2 b/lib/libc/sys/getitimer.2
index 485c06761e05e..db629f4c7d857 100644
--- a/lib/libc/sys/getitimer.2
+++ b/lib/libc/sys/getitimer.2
@@ -34,7 +34,7 @@
 .\"
 .Dd May 16, 1995
 .Dt GETITIMER 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm getitimer ,
 .Nm setitimer
diff --git a/lib/libc/sys/getlogin.2 b/lib/libc/sys/getlogin.2
index c52bb2e2e1e15..89c9211cea8c0 100644
--- a/lib/libc/sys/getlogin.2
+++ b/lib/libc/sys/getlogin.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 9, 1993
 .Dt GETLOGIN 2
-.Os BSD 4.4
+.Os
 .Sh NAME
 .Nm getlogin ,
 .Nm getlogin_r ,
diff --git a/lib/libc/sys/getpeername.2 b/lib/libc/sys/getpeername.2
index a7cd663a92b23..20d9f532031d6 100644
--- a/lib/libc/sys/getpeername.2
+++ b/lib/libc/sys/getpeername.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETPEERNAME 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm getpeername
 .Nd get name of connected peer
diff --git a/lib/libc/sys/getpgrp.2 b/lib/libc/sys/getpgrp.2
index 6197ff5286e0a..9e3fa54a36152 100644
--- a/lib/libc/sys/getpgrp.2
+++ b/lib/libc/sys/getpgrp.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETPGRP 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm getpgrp
 .Nd get process group
diff --git a/lib/libc/sys/getpid.2 b/lib/libc/sys/getpid.2
index 1eb77410c50f4..70c0b657a10a3 100644
--- a/lib/libc/sys/getpid.2
+++ b/lib/libc/sys/getpid.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETPID 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm getpid ,
 .Nm getppid
diff --git a/lib/libc/sys/getpriority.2 b/lib/libc/sys/getpriority.2
index 1047cf7f60243..8a8d57b15a8f3 100644
--- a/lib/libc/sys/getpriority.2
+++ b/lib/libc/sys/getpriority.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETPRIORITY 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm getpriority ,
 .Nm setpriority
diff --git a/lib/libc/sys/getrlimit.2 b/lib/libc/sys/getrlimit.2
index 4f67802b1662c..ceac426621ab5 100644
--- a/lib/libc/sys/getrlimit.2
+++ b/lib/libc/sys/getrlimit.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETRLIMIT 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm getrlimit ,
 .Nm setrlimit
diff --git a/lib/libc/sys/getrusage.2 b/lib/libc/sys/getrusage.2
index 9e441510e179f..ad7f58514b21b 100644
--- a/lib/libc/sys/getrusage.2
+++ b/lib/libc/sys/getrusage.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETRUSAGE 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm getrusage
 .Nd get information about resource utilization
diff --git a/lib/libc/sys/getsid.2 b/lib/libc/sys/getsid.2
index 00f46c90c1f48..627daf9ca1249 100644
--- a/lib/libc/sys/getsid.2
+++ b/lib/libc/sys/getsid.2
@@ -25,7 +25,7 @@
 .\"
 .Dd August 19, 1997
 .Dt GETSID 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm getsid
 .Nd get process session
diff --git a/lib/libc/sys/getsockname.2 b/lib/libc/sys/getsockname.2
index d0262dcdbbd42..d2ecff92dedde 100644
--- a/lib/libc/sys/getsockname.2
+++ b/lib/libc/sys/getsockname.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETSOCKNAME 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm getsockname
 .Nd get socket name
diff --git a/lib/libc/sys/getsockopt.2 b/lib/libc/sys/getsockopt.2
index c9e9ba9b62e38..0f1a23b19afe2 100644
--- a/lib/libc/sys/getsockopt.2
+++ b/lib/libc/sys/getsockopt.2
@@ -34,7 +34,7 @@
 .\"
 .Dd May 2, 1995
 .Dt GETSOCKOPT 2
-.Os BSD 4.3r
+.Os
 .Sh NAME
 .Nm getsockopt ,
 .Nm setsockopt
diff --git a/lib/libc/sys/gettimeofday.2 b/lib/libc/sys/gettimeofday.2
index e6554cc211cea..6b8f3f614d0f1 100644
--- a/lib/libc/sys/gettimeofday.2
+++ b/lib/libc/sys/gettimeofday.2
@@ -34,7 +34,7 @@
 .\"
 .Dd May 26, 1995
 .Dt GETTIMEOFDAY 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm gettimeofday ,
 .Nm settimeofday
diff --git a/lib/libc/sys/getuid.2 b/lib/libc/sys/getuid.2
index 01e464c14f683..1a762fed64b54 100644
--- a/lib/libc/sys/getuid.2
+++ b/lib/libc/sys/getuid.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt GETUID 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm getuid ,
 .Nm geteuid
diff --git a/lib/libc/sys/intro.2 b/lib/libc/sys/intro.2
index e25c5ba437a6f..07c1a023a34d9 100644
--- a/lib/libc/sys/intro.2
+++ b/lib/libc/sys/intro.2
@@ -34,7 +34,7 @@
 .\"
 .Dd February 27, 1995
 .Dt INTRO 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm intro
 .Nd introduction to system calls and error numbers
diff --git a/lib/libc/sys/ioctl.2 b/lib/libc/sys/ioctl.2
index af5c85228403f..5f75d4995c501 100644
--- a/lib/libc/sys/ioctl.2
+++ b/lib/libc/sys/ioctl.2
@@ -35,7 +35,7 @@
 .\"
 .Dd December 11, 1993
 .Dt IOCTL 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm ioctl
 .Nd control device
diff --git a/lib/libc/sys/jail.2 b/lib/libc/sys/jail.2
index e65eae6ba190f..cc0df2a2e8705 100644
--- a/lib/libc/sys/jail.2
+++ b/lib/libc/sys/jail.2
@@ -10,7 +10,7 @@
 .\"
 .Dd April 28, 1999
 .Dt JAIL 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm jail
 .Nd imprison current process and future decendants
diff --git a/lib/libc/sys/kill.2 b/lib/libc/sys/kill.2
index 5a7c05cb355ee..e641fd9a0f967 100644
--- a/lib/libc/sys/kill.2
+++ b/lib/libc/sys/kill.2
@@ -34,7 +34,7 @@
 .\"
 .Dd April 19, 1994
 .Dt KILL 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm kill
 .Nd send signal to a process
diff --git a/lib/libc/sys/kldfind.2 b/lib/libc/sys/kldfind.2
index 78cd3be993103..aabd41d9403fc 100644
--- a/lib/libc/sys/kldfind.2
+++ b/lib/libc/sys/kldfind.2
@@ -27,7 +27,7 @@
 .\"
 .Dd March 3, 1999
 .Dt KLDFIND 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm kldfind
 .Nd returns the fileid of a kld file 
diff --git a/lib/libc/sys/kldfirstmod.2 b/lib/libc/sys/kldfirstmod.2
index 1474f637bd631..fe928b862cfe3 100644
--- a/lib/libc/sys/kldfirstmod.2
+++ b/lib/libc/sys/kldfirstmod.2
@@ -27,7 +27,7 @@
 .\"
 .Dd March 3, 1999
 .Dt KLDFIRSTMOD 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm kldfirstmod
 .Nd "return first module id from the kld file specified"
diff --git a/lib/libc/sys/kldload.2 b/lib/libc/sys/kldload.2
index eb07468c07ed7..f897c83d582dd 100644
--- a/lib/libc/sys/kldload.2
+++ b/lib/libc/sys/kldload.2
@@ -27,7 +27,7 @@
 .\"
 .Dd March 3, 1999
 .Dt KLDLOAD 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm kldload
 .Nd load KLD files into the kernel 
diff --git a/lib/libc/sys/kldnext.2 b/lib/libc/sys/kldnext.2
index cef9d0aae385d..4ba8ca3375650 100644
--- a/lib/libc/sys/kldnext.2
+++ b/lib/libc/sys/kldnext.2
@@ -27,7 +27,7 @@
 .\"
 .Dd March 3, 1999
 .Dt KLDNEXT 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm kldnext
 .Nd return the fileid of the next kld file 
diff --git a/lib/libc/sys/kldstat.2 b/lib/libc/sys/kldstat.2
index 2617c00426ffa..48469051e1c25 100644
--- a/lib/libc/sys/kldstat.2
+++ b/lib/libc/sys/kldstat.2
@@ -27,7 +27,7 @@
 .\"
 .Dd March 3, 1999
 .Dt KLDSTAT 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm kldstat
 .Nd get status of kld file 
diff --git a/lib/libc/sys/kldunload.2 b/lib/libc/sys/kldunload.2
index 6ef3d3a94f39e..38ab3222a40da 100644
--- a/lib/libc/sys/kldunload.2
+++ b/lib/libc/sys/kldunload.2
@@ -27,7 +27,7 @@
 .\"
 .Dd March 3, 1999
 .Dt KLDUNLOAD 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm kldunload
 .Nd unload kld files
diff --git a/lib/libc/sys/ktrace.2 b/lib/libc/sys/ktrace.2
index db4c2d3359532..ded62e693e439 100644
--- a/lib/libc/sys/ktrace.2
+++ b/lib/libc/sys/ktrace.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt KTRACE 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm ktrace
 .Nd process tracing
diff --git a/lib/libc/sys/link.2 b/lib/libc/sys/link.2
index 31f43efa049b1..5ddc28b75f8e3 100644
--- a/lib/libc/sys/link.2
+++ b/lib/libc/sys/link.2
@@ -34,7 +34,7 @@
 .\"
 .Dd March 5, 1999
 .Dt LINK 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm link
 .Nd make a hard file link
diff --git a/lib/libc/sys/listen.2 b/lib/libc/sys/listen.2
index e7cb799089632..fd67ca4bdd26f 100644
--- a/lib/libc/sys/listen.2
+++ b/lib/libc/sys/listen.2
@@ -34,7 +34,7 @@
 .\"
 .Dd November 3, 1995
 .Dt LISTEN 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm listen
 .Nd listen for connections on a socket
diff --git a/lib/libc/sys/lseek.2 b/lib/libc/sys/lseek.2
index 5cc0f222240ba..e16102537bc69 100644
--- a/lib/libc/sys/lseek.2
+++ b/lib/libc/sys/lseek.2
@@ -34,7 +34,7 @@
 .\"
 .Dd April 19, 1994
 .Dt LSEEK 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm lseek
 .Nd reposition read/write file offset
diff --git a/lib/libc/sys/mkdir.2 b/lib/libc/sys/mkdir.2
index 9e0e4459c4beb..91374ce9f7cd1 100644
--- a/lib/libc/sys/mkdir.2
+++ b/lib/libc/sys/mkdir.2
@@ -34,7 +34,7 @@
 .\"
 .Dd December 11, 1993
 .Dt MKDIR 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm mkdir
 .Nd make a directory file
diff --git a/lib/libc/sys/mknod.2 b/lib/libc/sys/mknod.2
index 0910beed21edb..27d48b09f7419 100644
--- a/lib/libc/sys/mknod.2
+++ b/lib/libc/sys/mknod.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt MKNOD 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm mknod
 .Nd make a special file node
diff --git a/lib/libc/sys/mmap.2 b/lib/libc/sys/mmap.2
index 2c2c5799a512a..e9eb9d3b2a247 100644
--- a/lib/libc/sys/mmap.2
+++ b/lib/libc/sys/mmap.2
@@ -34,7 +34,7 @@
 .\"
 .Dd May 11, 1995
 .Dt MMAP 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm mmap
 .Nd allocate memory, or map files or devices into memory
diff --git a/lib/libc/sys/modfind.2 b/lib/libc/sys/modfind.2
index 9f8b7c92b37d1..ad29f2ea74d6e 100644
--- a/lib/libc/sys/modfind.2
+++ b/lib/libc/sys/modfind.2
@@ -27,7 +27,7 @@
 .\"
 .Dd September 28, 2000
 .Dt MODFIND 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm modfind
 .Nd returns the modid of a kernel module 
diff --git a/lib/libc/sys/modnext.2 b/lib/libc/sys/modnext.2
index 399836a6eb218..972cd8fe38f7e 100644
--- a/lib/libc/sys/modnext.2
+++ b/lib/libc/sys/modnext.2
@@ -27,7 +27,7 @@
 .\"
 .Dd September 28, 2000
 .Dt MODNEXT 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm modnext
 .Nd return the modid of the next kernel module
diff --git a/lib/libc/sys/mount.2 b/lib/libc/sys/mount.2
index b2c14d0f6893d..efc33846c3f1e 100644
--- a/lib/libc/sys/mount.2
+++ b/lib/libc/sys/mount.2
@@ -34,7 +34,7 @@
 .\"
 .Dd May 24, 1995
 .Dt MOUNT 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm mount ,
 .Nm unmount
diff --git a/lib/libc/sys/nanosleep.2 b/lib/libc/sys/nanosleep.2
index f272a9d583b3e..0c4749f6f47d4 100644
--- a/lib/libc/sys/nanosleep.2
+++ b/lib/libc/sys/nanosleep.2
@@ -37,7 +37,7 @@
 .\"
 .Dd April 17, 1997
 .Dt NANOSLEEP 2
-.Os 
+.Os
 .Sh NAME
 .Nm nanosleep
 .Nd suspend process execution for an interval measured in nanoseconds
diff --git a/lib/libc/sys/open.2 b/lib/libc/sys/open.2
index 82f6c8a67b25b..feb05c117cae8 100644
--- a/lib/libc/sys/open.2
+++ b/lib/libc/sys/open.2
@@ -34,7 +34,7 @@
 .\"
 .Dd November 16, 1993
 .Dt OPEN 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm open
 .Nd open or create a file for reading or writing
diff --git a/lib/libc/sys/pathconf.2 b/lib/libc/sys/pathconf.2
index a8797e64d5d90..90318c02b595f 100644
--- a/lib/libc/sys/pathconf.2
+++ b/lib/libc/sys/pathconf.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt PATHCONF 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pathconf ,
 .Nm fpathconf
diff --git a/lib/libc/sys/pipe.2 b/lib/libc/sys/pipe.2
index e63f6cff9be9d..0e0043f0d23f0 100644
--- a/lib/libc/sys/pipe.2
+++ b/lib/libc/sys/pipe.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt PIPE 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pipe
 .Nd create descriptor pair for interprocess communication
diff --git a/lib/libc/sys/ptrace.2 b/lib/libc/sys/ptrace.2
index c91b2d1a5ceef..29a8538177097 100644
--- a/lib/libc/sys/ptrace.2
+++ b/lib/libc/sys/ptrace.2
@@ -4,7 +4,7 @@
 .\" This file is in the public domain.
 .Dd January 20, 1996
 .Dt PTRACE 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm ptrace
 .Nd process tracing and debugging
diff --git a/lib/libc/sys/read.2 b/lib/libc/sys/read.2
index c797b5b0df9ac..90c8e78baf52e 100644
--- a/lib/libc/sys/read.2
+++ b/lib/libc/sys/read.2
@@ -34,7 +34,7 @@
 .\"
 .Dd February 26, 1994
 .Dt READ 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm read ,
 .Nm readv ,
diff --git a/lib/libc/sys/readlink.2 b/lib/libc/sys/readlink.2
index 160686d4941b0..4708594b4289e 100644
--- a/lib/libc/sys/readlink.2
+++ b/lib/libc/sys/readlink.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt READLINK 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm readlink
 .Nd read value of a symbolic link
diff --git a/lib/libc/sys/reboot.2 b/lib/libc/sys/reboot.2
index 411e689e12176..cf347452f9106 100644
--- a/lib/libc/sys/reboot.2
+++ b/lib/libc/sys/reboot.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt REBOOT 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm reboot
 .Nd reboot system or halt processor
diff --git a/lib/libc/sys/recv.2 b/lib/libc/sys/recv.2
index f9202cba33ea3..7830d77e608b9 100644
--- a/lib/libc/sys/recv.2
+++ b/lib/libc/sys/recv.2
@@ -34,7 +34,7 @@
 .\"
 .Dd February 21, 1994
 .Dt RECV 2
-.Os BSD 4.3r
+.Os
 .Sh NAME
 .Nm recv ,
 .Nm recvfrom ,
diff --git a/lib/libc/sys/rename.2 b/lib/libc/sys/rename.2
index 31678f597bc02..91bf125a5476c 100644
--- a/lib/libc/sys/rename.2
+++ b/lib/libc/sys/rename.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt RENAME 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm rename
 .Nd change the name of a file
diff --git a/lib/libc/sys/rmdir.2 b/lib/libc/sys/rmdir.2
index 523bc21e1b1a0..d637c93e16814 100644
--- a/lib/libc/sys/rmdir.2
+++ b/lib/libc/sys/rmdir.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt RMDIR 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm rmdir
 .Nd remove a directory file
diff --git a/lib/libc/sys/rtprio.2 b/lib/libc/sys/rtprio.2
index 517d1dda35b27..3f902c0b3fe87 100644
--- a/lib/libc/sys/rtprio.2
+++ b/lib/libc/sys/rtprio.2
@@ -31,7 +31,7 @@
 .\"
 .Dd July 23, 1994
 .Dt RTPRIO 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm rtprio
 .Nd examine or modify a process realtime or idle priority
diff --git a/lib/libc/sys/sched_get_priority_max.2 b/lib/libc/sys/sched_get_priority_max.2
index db06f5777d12a..cebce154d2336 100644
--- a/lib/libc/sys/sched_get_priority_max.2
+++ b/lib/libc/sys/sched_get_priority_max.2
@@ -25,7 +25,7 @@
 .\"
 .Dd March 12, 1998
 .Dt SCHED_GET_PRIORITY_MAX 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm sched_get_priority_max ,
 .Nm sched_get_priority_min ,
diff --git a/lib/libc/sys/sched_setparam.2 b/lib/libc/sys/sched_setparam.2
index 69d193e1a16ee..d937114443866 100644
--- a/lib/libc/sys/sched_setparam.2
+++ b/lib/libc/sys/sched_setparam.2
@@ -25,7 +25,7 @@
 .\"
 .Dd March 12, 1998
 .Dt SCHED_SETPARAM 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm sched_setparam ,
 .Nm sched_getparam
diff --git a/lib/libc/sys/sched_setscheduler.2 b/lib/libc/sys/sched_setscheduler.2
index 0341f16b47083..ff3d5adc02b96 100644
--- a/lib/libc/sys/sched_setscheduler.2
+++ b/lib/libc/sys/sched_setscheduler.2
@@ -25,7 +25,7 @@
 .\"
 .Dd March 12, 1998
 .Dt SCHED_SETSCHEDULER 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm sched_setscheduler ,
 .Nm sched_getscheduler
diff --git a/lib/libc/sys/sched_yield.2 b/lib/libc/sys/sched_yield.2
index 41f0af3fc7998..ed886c74e1724 100644
--- a/lib/libc/sys/sched_yield.2
+++ b/lib/libc/sys/sched_yield.2
@@ -25,7 +25,7 @@
 .\"
 .Dd March 12, 1998
 .Dt SCHED_YIELD 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm sched_yield
 .Nd yield processor
diff --git a/lib/libc/sys/select.2 b/lib/libc/sys/select.2
index 16e6be2111e03..058041ff1caf7 100644
--- a/lib/libc/sys/select.2
+++ b/lib/libc/sys/select.2
@@ -34,7 +34,7 @@
 .\"
 .Dd March 25, 1994
 .Dt SELECT 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm select
 .Nd synchronous I/O multiplexing
diff --git a/lib/libc/sys/semctl.2 b/lib/libc/sys/semctl.2
index 6fa120b3bd27b..44465863e3886 100644
--- a/lib/libc/sys/semctl.2
+++ b/lib/libc/sys/semctl.2
@@ -27,7 +27,7 @@
 .\"
 .Dd September 12, 1995
 .Dt SEMCTL 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm semctl
 .Nd control operations on a semaphore set
diff --git a/lib/libc/sys/semget.2 b/lib/libc/sys/semget.2
index dc22c0ac272f8..b35db9f2b1584 100644
--- a/lib/libc/sys/semget.2
+++ b/lib/libc/sys/semget.2
@@ -27,7 +27,7 @@
 .\"
 .Dd September 12, 1995
 .Dt SEMGET 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm semget
 .Nd obtain a semaphore id
diff --git a/lib/libc/sys/semop.2 b/lib/libc/sys/semop.2
index faf0224b1ef2f..b029d3a0bf0fc 100644
--- a/lib/libc/sys/semop.2
+++ b/lib/libc/sys/semop.2
@@ -27,7 +27,7 @@
 .\"
 .Dd September 22, 1995
 .Dt SEMOP 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm semop
 .Nd atomic array of operations on a semaphore set
diff --git a/lib/libc/sys/send.2 b/lib/libc/sys/send.2
index 1920059f3b120..f5749ee6ca0f7 100644
--- a/lib/libc/sys/send.2
+++ b/lib/libc/sys/send.2
@@ -34,7 +34,7 @@
 .\"
 .Dd February 15, 1995
 .Dt SEND 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm send ,
 .Nm sendto ,
diff --git a/lib/libc/sys/setgroups.2 b/lib/libc/sys/setgroups.2
index 43726bbdda655..0974f93b8e85e 100644
--- a/lib/libc/sys/setgroups.2
+++ b/lib/libc/sys/setgroups.2
@@ -34,7 +34,7 @@
 .\"
 .Dd April 16, 1994
 .Dt SETGROUPS 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm setgroups
 .Nd set group access list
diff --git a/lib/libc/sys/setpgid.2 b/lib/libc/sys/setpgid.2
index 0db4d2871831e..c5c8cecd53a7f 100644
--- a/lib/libc/sys/setpgid.2
+++ b/lib/libc/sys/setpgid.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt SETPGID 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm setpgid ,
 .Nm setpgrp
diff --git a/lib/libc/sys/setregid.2 b/lib/libc/sys/setregid.2
index f796856c6d3eb..358920bcc7c76 100644
--- a/lib/libc/sys/setregid.2
+++ b/lib/libc/sys/setregid.2
@@ -34,7 +34,7 @@
 .\"
 .Dd April 16, 1994
 .Dt SETREGID 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm setregid
 .Nd set real and effective group ID
diff --git a/lib/libc/sys/setreuid.2 b/lib/libc/sys/setreuid.2
index af8965fe17bbc..102d32bca6a1b 100644
--- a/lib/libc/sys/setreuid.2
+++ b/lib/libc/sys/setreuid.2
@@ -34,7 +34,7 @@
 .\"
 .Dd February 8, 2001
 .Dt SETREUID 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm setreuid
 .Nd set real and effective user ID's
diff --git a/lib/libc/sys/setuid.2 b/lib/libc/sys/setuid.2
index e9cccd7e9b600..9374e93447e69 100644
--- a/lib/libc/sys/setuid.2
+++ b/lib/libc/sys/setuid.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt SETUID 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm setuid ,
 .Nm seteuid ,
diff --git a/lib/libc/sys/shmat.2 b/lib/libc/sys/shmat.2
index 31408473c659d..3c3e40fd3c063 100644
--- a/lib/libc/sys/shmat.2
+++ b/lib/libc/sys/shmat.2
@@ -27,7 +27,7 @@
 .\"
 .Dd August 2, 1995
 .Dt SHMAT 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm shmat ,
 .Nm shmdt
diff --git a/lib/libc/sys/shmctl.2 b/lib/libc/sys/shmctl.2
index 9b5e8763808c3..9288bb5ce547f 100644
--- a/lib/libc/sys/shmctl.2
+++ b/lib/libc/sys/shmctl.2
@@ -27,7 +27,7 @@
 .\"
 .Dd July 17, 1995
 .Dt SHMCTL 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm shmctl
 .Nd shared memory control
diff --git a/lib/libc/sys/shmget.2 b/lib/libc/sys/shmget.2
index 05bc68cf66feb..bf0bb588f6129 100644
--- a/lib/libc/sys/shmget.2
+++ b/lib/libc/sys/shmget.2
@@ -27,7 +27,7 @@
 .\"
 .Dd July 3, 1995
 .Dt SHMGET 2
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm shmget
 .Nd obtain a shared memory identifier
diff --git a/lib/libc/sys/sigaltstack.2 b/lib/libc/sys/sigaltstack.2
index b7f8d3a810c7a..171cafc66cac1 100644
--- a/lib/libc/sys/sigaltstack.2
+++ b/lib/libc/sys/sigaltstack.2
@@ -34,7 +34,7 @@
 .\"
 .Dd May 1, 1995
 .Dt SIGALTSTACK 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm sigaltstack
 .Nd set and/or get signal stack context
diff --git a/lib/libc/sys/sigreturn.2 b/lib/libc/sys/sigreturn.2
index c5185fea7ea2b..674f45322b43b 100644
--- a/lib/libc/sys/sigreturn.2
+++ b/lib/libc/sys/sigreturn.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt SIGRETURN 2
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm sigreturn
 .Nd return from signal
diff --git a/lib/libc/sys/sigstack.2 b/lib/libc/sys/sigstack.2
index 4726fd95bca7f..61f58dbef0505 100644
--- a/lib/libc/sys/sigstack.2
+++ b/lib/libc/sys/sigstack.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt SIGSTACK 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm sigstack
 .Nd set and/or get signal stack context
diff --git a/lib/libc/sys/socket.2 b/lib/libc/sys/socket.2
index a3fb618a84fde..ef98bf5806812 100644
--- a/lib/libc/sys/socket.2
+++ b/lib/libc/sys/socket.2
@@ -34,7 +34,7 @@
 .\"
 .Dd November 24, 1997
 .Dt SOCKET 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm socket
 .Nd create an endpoint for communication
diff --git a/lib/libc/sys/socketpair.2 b/lib/libc/sys/socketpair.2
index ae4c337e7427e..1c5a15f391b28 100644
--- a/lib/libc/sys/socketpair.2
+++ b/lib/libc/sys/socketpair.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt SOCKETPAIR 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm socketpair
 .Nd create a pair of connected sockets
diff --git a/lib/libc/sys/stat.2 b/lib/libc/sys/stat.2
index e611913cc4c97..f65c97001bcdd 100644
--- a/lib/libc/sys/stat.2
+++ b/lib/libc/sys/stat.2
@@ -34,7 +34,7 @@
 .\"
 .Dd May 1, 1995
 .Dt STAT 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm stat ,
 .Nm lstat ,
diff --git a/lib/libc/sys/swapon.2 b/lib/libc/sys/swapon.2
index 998d9a4625108..1eb2b0545cb10 100644
--- a/lib/libc/sys/swapon.2
+++ b/lib/libc/sys/swapon.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt SWAPON 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm swapon
 .Nd add a swap device for interleaved paging/swapping
diff --git a/lib/libc/sys/symlink.2 b/lib/libc/sys/symlink.2
index 92e1849a2c227..ea3ca385b7556 100644
--- a/lib/libc/sys/symlink.2
+++ b/lib/libc/sys/symlink.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt SYMLINK 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm symlink
 .Nd make symbolic link to a file
diff --git a/lib/libc/sys/sync.2 b/lib/libc/sys/sync.2
index 9e88b6bf2f7d3..f5e112cfe639f 100644
--- a/lib/libc/sys/sync.2
+++ b/lib/libc/sys/sync.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt SYNC 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm sync
 .Nd "schedule filesystem updates"
diff --git a/lib/libc/sys/syscall.2 b/lib/libc/sys/syscall.2
index f30e2ff6f22a1..ea8d639cd3cb5 100644
--- a/lib/libc/sys/syscall.2
+++ b/lib/libc/sys/syscall.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 16, 1993
 .Dt SYSCALL 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm syscall ,
 .Nm __syscall
diff --git a/lib/libc/sys/truncate.2 b/lib/libc/sys/truncate.2
index 7456adce69932..fb3311f494fab 100644
--- a/lib/libc/sys/truncate.2
+++ b/lib/libc/sys/truncate.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt TRUNCATE 2
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm truncate ,
 .Nm ftruncate
diff --git a/lib/libc/sys/umask.2 b/lib/libc/sys/umask.2
index eb6064edc20d6..4e7815bf20500 100644
--- a/lib/libc/sys/umask.2
+++ b/lib/libc/sys/umask.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt UMASK 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm umask
 .Nd set file creation mode mask
diff --git a/lib/libc/sys/undelete.2 b/lib/libc/sys/undelete.2
index be92affe77f69..b9ba8af6e11b0 100644
--- a/lib/libc/sys/undelete.2
+++ b/lib/libc/sys/undelete.2
@@ -35,7 +35,7 @@
 .\"
 .Dd October 18, 1994
 .Dt UNDELETE 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm undelete
 .Nd attempt to recover a deleted file
diff --git a/lib/libc/sys/unlink.2 b/lib/libc/sys/unlink.2
index 15fe8444af6ff..c547825a0ad3e 100644
--- a/lib/libc/sys/unlink.2
+++ b/lib/libc/sys/unlink.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt UNLINK 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm unlink
 .Nd remove directory entry
diff --git a/lib/libc/sys/vfork.2 b/lib/libc/sys/vfork.2
index 838fdc51fd056..91a28ee291e10 100644
--- a/lib/libc/sys/vfork.2
+++ b/lib/libc/sys/vfork.2
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt VFORK 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm vfork
 .Nd spawn new process in a virtual memory efficient way
diff --git a/lib/libc/sys/wait.2 b/lib/libc/sys/wait.2
index 598597e98c5d1..3fa5c2bbfb149 100644
--- a/lib/libc/sys/wait.2
+++ b/lib/libc/sys/wait.2
@@ -34,7 +34,7 @@
 .\"
 .Dd April 19, 1994
 .Dt WAIT 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm wait ,
 .Nm waitpid ,
diff --git a/lib/libc/sys/write.2 b/lib/libc/sys/write.2
index a306cc1cc7701..255447d50e003 100644
--- a/lib/libc/sys/write.2
+++ b/lib/libc/sys/write.2
@@ -34,7 +34,7 @@
 .\"
 .Dd April 2, 1994
 .Dt WRITE 2
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm write ,
 .Nm writev ,
diff --git a/lib/libc_r/man/pthread_cleanup_pop.3 b/lib/libc_r/man/pthread_cleanup_pop.3
index 3cefb61322997..38fc46ca05fd8 100644
--- a/lib/libc_r/man/pthread_cleanup_pop.3
+++ b/lib/libc_r/man/pthread_cleanup_pop.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 30, 1998
 .Dt PTHREAD_CLEANUP_POP 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cleanup_pop
 .Nd call the first cleanup routine
diff --git a/lib/libc_r/man/pthread_cleanup_push.3 b/lib/libc_r/man/pthread_cleanup_push.3
index 70ee964f6b96d..5cc2a1e0cb79f 100644
--- a/lib/libc_r/man/pthread_cleanup_push.3
+++ b/lib/libc_r/man/pthread_cleanup_push.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 30, 1998
 .Dt PTHREAD_CLEANUP_PUSH 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cleanup_push
 .Nd add a cleanup function for thread exit
diff --git a/lib/libc_r/man/pthread_cond_broadcast.3 b/lib/libc_r/man/pthread_cond_broadcast.3
index 5a5f1a8994594..f881886ed6cc2 100644
--- a/lib/libc_r/man/pthread_cond_broadcast.3
+++ b/lib/libc_r/man/pthread_cond_broadcast.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_BROADCAST 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_broadcast
 .Nd unblock all threads waiting for a condition variable
diff --git a/lib/libc_r/man/pthread_cond_destroy.3 b/lib/libc_r/man/pthread_cond_destroy.3
index fb93c07ea3d43..4ac17f951623c 100644
--- a/lib/libc_r/man/pthread_cond_destroy.3
+++ b/lib/libc_r/man/pthread_cond_destroy.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_DESTROY 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_destroy
 .Nd destroy a condition variable
diff --git a/lib/libc_r/man/pthread_cond_init.3 b/lib/libc_r/man/pthread_cond_init.3
index 4c7a637cede50..5339f38259a03 100644
--- a/lib/libc_r/man/pthread_cond_init.3
+++ b/lib/libc_r/man/pthread_cond_init.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_INIT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_init
 .Nd create a condition variable
diff --git a/lib/libc_r/man/pthread_cond_signal.3 b/lib/libc_r/man/pthread_cond_signal.3
index 540b84c8f4b4f..654d5a8031227 100644
--- a/lib/libc_r/man/pthread_cond_signal.3
+++ b/lib/libc_r/man/pthread_cond_signal.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_SIGNAL 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_signal
 .Nd unblock a thread waiting for a condition variable
diff --git a/lib/libc_r/man/pthread_cond_timedwait.3 b/lib/libc_r/man/pthread_cond_timedwait.3
index 1d0fe70d52048..b0c56e80fe3ac 100644
--- a/lib/libc_r/man/pthread_cond_timedwait.3
+++ b/lib/libc_r/man/pthread_cond_timedwait.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_TIMEDWAIT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_timedwait
 .Nd "wait on a condition variable for a specific amount of time"
diff --git a/lib/libc_r/man/pthread_cond_wait.3 b/lib/libc_r/man/pthread_cond_wait.3
index abe44c72565b3..e9fde91842f80 100644
--- a/lib/libc_r/man/pthread_cond_wait.3
+++ b/lib/libc_r/man/pthread_cond_wait.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_WAIT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_wait
 .Nd wait on a condition variable
diff --git a/lib/libc_r/man/pthread_create.3 b/lib/libc_r/man/pthread_create.3
index 2dae2a1f657ec..5f2d24ce8ed3c 100644
--- a/lib/libc_r/man/pthread_create.3
+++ b/lib/libc_r/man/pthread_create.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_CREATE 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_create
 .Nd create a new thread
diff --git a/lib/libc_r/man/pthread_detach.3 b/lib/libc_r/man/pthread_detach.3
index fed4483de8ef4..75c9d42f08c49 100644
--- a/lib/libc_r/man/pthread_detach.3
+++ b/lib/libc_r/man/pthread_detach.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_DETACH 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_detach
 .Nd detach a thread
diff --git a/lib/libc_r/man/pthread_equal.3 b/lib/libc_r/man/pthread_equal.3
index d08111038c8a2..be55e90b46ba0 100644
--- a/lib/libc_r/man/pthread_equal.3
+++ b/lib/libc_r/man/pthread_equal.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_EQUAL 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_equal
 .Nd compare thread IDs
diff --git a/lib/libc_r/man/pthread_exit.3 b/lib/libc_r/man/pthread_exit.3
index a21f6dc3a9ff2..5f6f75bd5212e 100644
--- a/lib/libc_r/man/pthread_exit.3
+++ b/lib/libc_r/man/pthread_exit.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_EXIT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_exit
 .Nd terminate the calling thread
diff --git a/lib/libc_r/man/pthread_getspecific.3 b/lib/libc_r/man/pthread_getspecific.3
index 4bcb0d9b50d95..c003f3fca8948 100644
--- a/lib/libc_r/man/pthread_getspecific.3
+++ b/lib/libc_r/man/pthread_getspecific.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_GETSPECIFIC 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_getspecific
 .Nd get a thread-specific data value
diff --git a/lib/libc_r/man/pthread_join.3 b/lib/libc_r/man/pthread_join.3
index 3a68895fc5f24..f8e8e18a2feaa 100644
--- a/lib/libc_r/man/pthread_join.3
+++ b/lib/libc_r/man/pthread_join.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_JOIN 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_join
 .Nd wait for thread termination
diff --git a/lib/libc_r/man/pthread_key_create.3 b/lib/libc_r/man/pthread_key_create.3
index dcafc0c521135..d1fb922169490 100644
--- a/lib/libc_r/man/pthread_key_create.3
+++ b/lib/libc_r/man/pthread_key_create.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_KEY_CREATE 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_key_create
 .Nd thread-specific data key creation
diff --git a/lib/libc_r/man/pthread_key_delete.3 b/lib/libc_r/man/pthread_key_delete.3
index 06447e07abc01..9baa5020f12bc 100644
--- a/lib/libc_r/man/pthread_key_delete.3
+++ b/lib/libc_r/man/pthread_key_delete.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_KEY_DELETE 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_key_delete
 .Nd delete a thread-specific data key
diff --git a/lib/libc_r/man/pthread_mutex_destroy.3 b/lib/libc_r/man/pthread_mutex_destroy.3
index 0bb44d01d075c..f7b915d828205 100644
--- a/lib/libc_r/man/pthread_mutex_destroy.3
+++ b/lib/libc_r/man/pthread_mutex_destroy.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 29, 1998
 .Dt PTHREAD_MUTEX_DESTROY 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_mutex_destroy
 .Nd free resources allocated for a mutex
diff --git a/lib/libc_r/man/pthread_mutex_init.3 b/lib/libc_r/man/pthread_mutex_init.3
index 7d25baf41b55d..42b3a26a61f94 100644
--- a/lib/libc_r/man/pthread_mutex_init.3
+++ b/lib/libc_r/man/pthread_mutex_init.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 29, 1998
 .Dt PTHREAD_MUTEX_INIT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_mutex_init
 .Nd create a mutex
diff --git a/lib/libc_r/man/pthread_mutex_lock.3 b/lib/libc_r/man/pthread_mutex_lock.3
index 82dfaadf731b4..972d277eade43 100644
--- a/lib/libc_r/man/pthread_mutex_lock.3
+++ b/lib/libc_r/man/pthread_mutex_lock.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 30, 1998
 .Dt PTHREAD_MUTEX_LOCK 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_mutex_lock
 .Nd lock a mutex
diff --git a/lib/libc_r/man/pthread_mutex_trylock.3 b/lib/libc_r/man/pthread_mutex_trylock.3
index fa3bdf87a8c4b..143df146702c3 100644
--- a/lib/libc_r/man/pthread_mutex_trylock.3
+++ b/lib/libc_r/man/pthread_mutex_trylock.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 30, 1998
 .Dt PTHREAD_MUTEX_TRYLOCK 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_mutex_trylock
 .Nd attempt to lock a mutex without blocking
diff --git a/lib/libc_r/man/pthread_mutex_unlock.3 b/lib/libc_r/man/pthread_mutex_unlock.3
index e873be9904fa7..93e635496ec6c 100644
--- a/lib/libc_r/man/pthread_mutex_unlock.3
+++ b/lib/libc_r/man/pthread_mutex_unlock.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 30, 1998
 .Dt PTHREAD_MUTEX_UNLOCK 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_mutex_unlock
 .Nd unlock a mutex
diff --git a/lib/libc_r/man/pthread_once.3 b/lib/libc_r/man/pthread_once.3
index f3621d9a48943..736e32e94e2ee 100644
--- a/lib/libc_r/man/pthread_once.3
+++ b/lib/libc_r/man/pthread_once.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_ONCE 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_once
 .Nd dynamic package initialization
diff --git a/lib/libc_r/man/pthread_self.3 b/lib/libc_r/man/pthread_self.3
index 9723b5eebdc1d..acd46e9955b70 100644
--- a/lib/libc_r/man/pthread_self.3
+++ b/lib/libc_r/man/pthread_self.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_SELF 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_self
 .Nd get the calling thread's ID
diff --git a/lib/libc_r/man/pthread_setspecific.3 b/lib/libc_r/man/pthread_setspecific.3
index 698c3ca807c50..5265def7e7f18 100644
--- a/lib/libc_r/man/pthread_setspecific.3
+++ b/lib/libc_r/man/pthread_setspecific.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_SETSPECIFIC 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_setspecific
 .Nd set a thread-specific data value
diff --git a/lib/libcam/cam.3 b/lib/libcam/cam.3
index c774a6601b387..fd838d35f4d0c 100644
--- a/lib/libcam/cam.3
+++ b/lib/libcam/cam.3
@@ -28,7 +28,7 @@
 .\" $FreeBSD$
 .\"
 .Dd October 10, 1998
-.Os FreeBSD
+.Os
 .Dt CAM 3
 .Sh NAME
 .Nm cam_open_device ,
diff --git a/lib/libcam/cam_cdbparse.3 b/lib/libcam/cam_cdbparse.3
index 9f7a80c5ac8f4..741afb5337322 100644
--- a/lib/libcam/cam_cdbparse.3
+++ b/lib/libcam/cam_cdbparse.3
@@ -62,7 +62,7 @@
 .\"
 .\"
 .Dd October 13, 1998
-.Os FreeBSD
+.Os
 .Dt CAM_CDBPARSE 3
 .Sh NAME
 .Nm csio_build ,
diff --git a/lib/libcompat/4.1/ftime.3 b/lib/libcompat/4.1/ftime.3
index 3e573df3199a1..4896fa0353793 100644
--- a/lib/libcompat/4.1/ftime.3
+++ b/lib/libcompat/4.1/ftime.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt FTIME 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm ftime
 .Nd get date and time
diff --git a/lib/libcompat/4.1/stty.3 b/lib/libcompat/4.1/stty.3
index 6c6bb882a8640..95b6589e79ce9 100644
--- a/lib/libcompat/4.1/stty.3
+++ b/lib/libcompat/4.1/stty.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt STTY 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm stty ,
 .Nm gtty
diff --git a/lib/libcompat/4.3/insque.3 b/lib/libcompat/4.3/insque.3
index e2adae1984a1f..29ea3f425311e 100644
--- a/lib/libcompat/4.3/insque.3
+++ b/lib/libcompat/4.3/insque.3
@@ -34,7 +34,7 @@
 .\"
 .Dd December 11, 1993
 .Dt INSQUE 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm insque ,
 .Nm remque
diff --git a/lib/libcompat/4.3/rexec.3 b/lib/libcompat/4.3/rexec.3
index baa460102cd2f..a1b2a89ace37c 100644
--- a/lib/libcompat/4.3/rexec.3
+++ b/lib/libcompat/4.3/rexec.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt REXEC 3
-.Os BSD 4.2
+.Os
 .Sh NAME
 .Nm rexec
 .Nd return stream to a remote command
diff --git a/lib/libcrypt/crypt.3 b/lib/libcrypt/crypt.3
index d1e99ffc2d0d1..01222d2c7fa69 100644
--- a/lib/libcrypt/crypt.3
+++ b/lib/libcrypt/crypt.3
@@ -33,7 +33,7 @@
 .\"
 .Dd January 19, 1997
 .Dt CRYPT 3
-.Os "FreeSec 1.0"
+.Os
 .Sh NAME
 .Nm crypt
 .Nd Trapdoor encryption
diff --git a/lib/libdevstat/devstat.3 b/lib/libdevstat/devstat.3
index 67e06e825371a..c7418a7563845 100644
--- a/lib/libdevstat/devstat.3
+++ b/lib/libdevstat/devstat.3
@@ -29,7 +29,7 @@
 .\"
 .Dd May 21, 1998
 .Dt DEVSTAT 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm devstat ,
 .Nm getnumdevs ,
diff --git a/lib/libedit/editline.3 b/lib/libedit/editline.3
index e9688183776bb..ab744ef1f736f 100644
--- a/lib/libedit/editline.3
+++ b/lib/libedit/editline.3
@@ -36,7 +36,7 @@
 .\" $FreeBSD$
 .\"
 .Dd January 11, 1997
-.Os BSD 4.4
+.Os
 .Dt EDITLINE 3
 .Sh NAME
 .Nm editline ,
diff --git a/lib/libedit/editrc.5 b/lib/libedit/editrc.5
index 25c0a6f5d2157..62d993c7757ff 100644
--- a/lib/libedit/editrc.5
+++ b/lib/libedit/editrc.5
@@ -36,7 +36,7 @@
 .\" $FreeBSD$
 .\"
 .Dd January 11, 1997
-.Os BSD 4.4
+.Os
 .Dt EDITRC 5
 .Sh NAME
 .Nm editrc
diff --git a/lib/libipx/ipx.3 b/lib/libipx/ipx.3
index 89f08789cd130..bec7649307c9b 100644
--- a/lib/libipx/ipx.3
+++ b/lib/libipx/ipx.3
@@ -33,7 +33,7 @@
 .\"
 .Dd June 4, 1993
 .Dt IPX 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm ipx_addr ,
 .Nm ipx_ntoa
diff --git a/lib/libm/common_source/acosh.3 b/lib/libm/common_source/acosh.3
index 49dd7b2bcf4e5..a0b8498500913 100644
--- a/lib/libm/common_source/acosh.3
+++ b/lib/libm/common_source/acosh.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt ACOSH 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm acosh
 .Nd inverse hyperbolic cosine function
diff --git a/lib/libm/common_source/asinh.3 b/lib/libm/common_source/asinh.3
index fbf8f163f2182..a69e00fa71575 100644
--- a/lib/libm/common_source/asinh.3
+++ b/lib/libm/common_source/asinh.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt ASINH 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm asinh
 .Nd inverse hyperbolic sine function
diff --git a/lib/libm/common_source/atanh.3 b/lib/libm/common_source/atanh.3
index 25bdd4d9fcb4b..db67a382bd390 100644
--- a/lib/libm/common_source/atanh.3
+++ b/lib/libm/common_source/atanh.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt ATANH 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm atanh
 .Nd inverse hyperbolic tangent function
diff --git a/lib/libm/common_source/erf.3 b/lib/libm/common_source/erf.3
index 4c7391c5847ce..442a1b3c4782a 100644
--- a/lib/libm/common_source/erf.3
+++ b/lib/libm/common_source/erf.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt ERF 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm erf ,
 .Nm erfc
diff --git a/lib/libm/common_source/exp.3 b/lib/libm/common_source/exp.3
index 10de794495fd8..3c8a5aa6da2a0 100644
--- a/lib/libm/common_source/exp.3
+++ b/lib/libm/common_source/exp.3
@@ -34,7 +34,7 @@
 .\"
 .Dd April 19, 1994
 .Dt EXP 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm exp ,
 .Nm expm1 ,
diff --git a/lib/libm/common_source/hypot.3 b/lib/libm/common_source/hypot.3
index 2f77bb0462a87..7c1b14aecc279 100644
--- a/lib/libm/common_source/hypot.3
+++ b/lib/libm/common_source/hypot.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt HYPOT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm hypot ,
 .Nm cabs
diff --git a/lib/libm/common_source/ieee.3 b/lib/libm/common_source/ieee.3
index aaed641f7df4c..c918418850b04 100644
--- a/lib/libm/common_source/ieee.3
+++ b/lib/libm/common_source/ieee.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt IEEE 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm copysign ,
 .Nm drem ,
diff --git a/lib/libm/common_source/infnan.3 b/lib/libm/common_source/infnan.3
index 954f38258fa26..e4ca774cab751 100644
--- a/lib/libm/common_source/infnan.3
+++ b/lib/libm/common_source/infnan.3
@@ -34,7 +34,7 @@
 .\"
 .Dd June 4, 1993
 .Dt INFNAN 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm infnan
 .Nd signals invalid floating\-point operations on a
diff --git a/lib/libm/common_source/j0.3 b/lib/libm/common_source/j0.3
index 8fc32e8a5fa9c..430619e8f6f7b 100644
--- a/lib/libm/common_source/j0.3
+++ b/lib/libm/common_source/j0.3
@@ -34,7 +34,7 @@
 .\"
 .Dd April 19, 1994
 .Dt J0 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm j0 ,
 .Nm j1 ,
diff --git a/lib/libm/common_source/lgamma.3 b/lib/libm/common_source/lgamma.3
index 537b5b795e0e8..feb5a86ad0783 100644
--- a/lib/libm/common_source/lgamma.3
+++ b/lib/libm/common_source/lgamma.3
@@ -34,7 +34,7 @@
 .\"
 .Dd December 11, 1993
 .Dt LGAMMA 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm lgamma
 .Nm gamma
diff --git a/lib/libmd/mdX.3 b/lib/libmd/mdX.3
index 0a290c7360f92..2363200f29a0d 100644
--- a/lib/libmd/mdX.3
+++ b/lib/libmd/mdX.3
@@ -10,7 +10,7 @@
 .\"
 .Dd February 11, 1999
 .Dt MDX 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm MDXInit ,
 .Nm MDXUpdate ,
diff --git a/lib/libmd/ripemd.3 b/lib/libmd/ripemd.3
index b43bde7c58e5d..273a3bf1dda8e 100644
--- a/lib/libmd/ripemd.3
+++ b/lib/libmd/ripemd.3
@@ -11,7 +11,7 @@
 .\"
 .Dd February 26, 1999
 .Dt RIPEMD 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm RIPEMD160_Init ,
 .Nm RIPEMD160_Update ,
diff --git a/lib/libmd/sha.3 b/lib/libmd/sha.3
index 6e546e6b8e182..16bf68eab3340 100644
--- a/lib/libmd/sha.3
+++ b/lib/libmd/sha.3
@@ -11,7 +11,7 @@
 .\"
 .Dd February 25, 1999
 .Dt SHA 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm SHA_Init ,
 .Nm SHA_Update ,
diff --git a/lib/libnetgraph/netgraph.3 b/lib/libnetgraph/netgraph.3
index 0030e34dd5a73..92640fbfc6e21 100644
--- a/lib/libnetgraph/netgraph.3
+++ b/lib/libnetgraph/netgraph.3
@@ -37,7 +37,7 @@
 .\"
 .Dd January 19, 1999
 .Dt NETGRAPH 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm NgMkSockNode ,
 .Nm NgNameNode ,
diff --git a/lib/libpam/modules/pam_radius/pam_radius.8 b/lib/libpam/modules/pam_radius/pam_radius.8
index abe00954c8289..240e1229e9b2b 100644
--- a/lib/libpam/modules/pam_radius/pam_radius.8
+++ b/lib/libpam/modules/pam_radius/pam_radius.8
@@ -40,7 +40,7 @@
 .\"
 .Dd August 2, 1999
 .Dt PAM_RADIUS 8
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm pam_radius
 .Nd RADIUS authentication PAM module
diff --git a/lib/libpthread/man/pthread_cleanup_pop.3 b/lib/libpthread/man/pthread_cleanup_pop.3
index 3cefb61322997..38fc46ca05fd8 100644
--- a/lib/libpthread/man/pthread_cleanup_pop.3
+++ b/lib/libpthread/man/pthread_cleanup_pop.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 30, 1998
 .Dt PTHREAD_CLEANUP_POP 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cleanup_pop
 .Nd call the first cleanup routine
diff --git a/lib/libpthread/man/pthread_cleanup_push.3 b/lib/libpthread/man/pthread_cleanup_push.3
index 70ee964f6b96d..5cc2a1e0cb79f 100644
--- a/lib/libpthread/man/pthread_cleanup_push.3
+++ b/lib/libpthread/man/pthread_cleanup_push.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 30, 1998
 .Dt PTHREAD_CLEANUP_PUSH 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cleanup_push
 .Nd add a cleanup function for thread exit
diff --git a/lib/libpthread/man/pthread_cond_broadcast.3 b/lib/libpthread/man/pthread_cond_broadcast.3
index 5a5f1a8994594..f881886ed6cc2 100644
--- a/lib/libpthread/man/pthread_cond_broadcast.3
+++ b/lib/libpthread/man/pthread_cond_broadcast.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_BROADCAST 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_broadcast
 .Nd unblock all threads waiting for a condition variable
diff --git a/lib/libpthread/man/pthread_cond_destroy.3 b/lib/libpthread/man/pthread_cond_destroy.3
index fb93c07ea3d43..4ac17f951623c 100644
--- a/lib/libpthread/man/pthread_cond_destroy.3
+++ b/lib/libpthread/man/pthread_cond_destroy.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_DESTROY 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_destroy
 .Nd destroy a condition variable
diff --git a/lib/libpthread/man/pthread_cond_init.3 b/lib/libpthread/man/pthread_cond_init.3
index 4c7a637cede50..5339f38259a03 100644
--- a/lib/libpthread/man/pthread_cond_init.3
+++ b/lib/libpthread/man/pthread_cond_init.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_INIT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_init
 .Nd create a condition variable
diff --git a/lib/libpthread/man/pthread_cond_signal.3 b/lib/libpthread/man/pthread_cond_signal.3
index 540b84c8f4b4f..654d5a8031227 100644
--- a/lib/libpthread/man/pthread_cond_signal.3
+++ b/lib/libpthread/man/pthread_cond_signal.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_SIGNAL 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_signal
 .Nd unblock a thread waiting for a condition variable
diff --git a/lib/libpthread/man/pthread_cond_timedwait.3 b/lib/libpthread/man/pthread_cond_timedwait.3
index 1d0fe70d52048..b0c56e80fe3ac 100644
--- a/lib/libpthread/man/pthread_cond_timedwait.3
+++ b/lib/libpthread/man/pthread_cond_timedwait.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_TIMEDWAIT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_timedwait
 .Nd "wait on a condition variable for a specific amount of time"
diff --git a/lib/libpthread/man/pthread_cond_wait.3 b/lib/libpthread/man/pthread_cond_wait.3
index abe44c72565b3..e9fde91842f80 100644
--- a/lib/libpthread/man/pthread_cond_wait.3
+++ b/lib/libpthread/man/pthread_cond_wait.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_WAIT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_wait
 .Nd wait on a condition variable
diff --git a/lib/libpthread/man/pthread_create.3 b/lib/libpthread/man/pthread_create.3
index 2dae2a1f657ec..5f2d24ce8ed3c 100644
--- a/lib/libpthread/man/pthread_create.3
+++ b/lib/libpthread/man/pthread_create.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_CREATE 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_create
 .Nd create a new thread
diff --git a/lib/libpthread/man/pthread_detach.3 b/lib/libpthread/man/pthread_detach.3
index fed4483de8ef4..75c9d42f08c49 100644
--- a/lib/libpthread/man/pthread_detach.3
+++ b/lib/libpthread/man/pthread_detach.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_DETACH 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_detach
 .Nd detach a thread
diff --git a/lib/libpthread/man/pthread_equal.3 b/lib/libpthread/man/pthread_equal.3
index d08111038c8a2..be55e90b46ba0 100644
--- a/lib/libpthread/man/pthread_equal.3
+++ b/lib/libpthread/man/pthread_equal.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_EQUAL 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_equal
 .Nd compare thread IDs
diff --git a/lib/libpthread/man/pthread_exit.3 b/lib/libpthread/man/pthread_exit.3
index a21f6dc3a9ff2..5f6f75bd5212e 100644
--- a/lib/libpthread/man/pthread_exit.3
+++ b/lib/libpthread/man/pthread_exit.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_EXIT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_exit
 .Nd terminate the calling thread
diff --git a/lib/libpthread/man/pthread_getspecific.3 b/lib/libpthread/man/pthread_getspecific.3
index 4bcb0d9b50d95..c003f3fca8948 100644
--- a/lib/libpthread/man/pthread_getspecific.3
+++ b/lib/libpthread/man/pthread_getspecific.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_GETSPECIFIC 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_getspecific
 .Nd get a thread-specific data value
diff --git a/lib/libpthread/man/pthread_join.3 b/lib/libpthread/man/pthread_join.3
index 3a68895fc5f24..f8e8e18a2feaa 100644
--- a/lib/libpthread/man/pthread_join.3
+++ b/lib/libpthread/man/pthread_join.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_JOIN 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_join
 .Nd wait for thread termination
diff --git a/lib/libpthread/man/pthread_key_create.3 b/lib/libpthread/man/pthread_key_create.3
index dcafc0c521135..d1fb922169490 100644
--- a/lib/libpthread/man/pthread_key_create.3
+++ b/lib/libpthread/man/pthread_key_create.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_KEY_CREATE 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_key_create
 .Nd thread-specific data key creation
diff --git a/lib/libpthread/man/pthread_key_delete.3 b/lib/libpthread/man/pthread_key_delete.3
index 06447e07abc01..9baa5020f12bc 100644
--- a/lib/libpthread/man/pthread_key_delete.3
+++ b/lib/libpthread/man/pthread_key_delete.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_KEY_DELETE 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_key_delete
 .Nd delete a thread-specific data key
diff --git a/lib/libpthread/man/pthread_mutex_destroy.3 b/lib/libpthread/man/pthread_mutex_destroy.3
index 0bb44d01d075c..f7b915d828205 100644
--- a/lib/libpthread/man/pthread_mutex_destroy.3
+++ b/lib/libpthread/man/pthread_mutex_destroy.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 29, 1998
 .Dt PTHREAD_MUTEX_DESTROY 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_mutex_destroy
 .Nd free resources allocated for a mutex
diff --git a/lib/libpthread/man/pthread_mutex_init.3 b/lib/libpthread/man/pthread_mutex_init.3
index 7d25baf41b55d..42b3a26a61f94 100644
--- a/lib/libpthread/man/pthread_mutex_init.3
+++ b/lib/libpthread/man/pthread_mutex_init.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 29, 1998
 .Dt PTHREAD_MUTEX_INIT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_mutex_init
 .Nd create a mutex
diff --git a/lib/libpthread/man/pthread_mutex_lock.3 b/lib/libpthread/man/pthread_mutex_lock.3
index 82dfaadf731b4..972d277eade43 100644
--- a/lib/libpthread/man/pthread_mutex_lock.3
+++ b/lib/libpthread/man/pthread_mutex_lock.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 30, 1998
 .Dt PTHREAD_MUTEX_LOCK 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_mutex_lock
 .Nd lock a mutex
diff --git a/lib/libpthread/man/pthread_mutex_trylock.3 b/lib/libpthread/man/pthread_mutex_trylock.3
index fa3bdf87a8c4b..143df146702c3 100644
--- a/lib/libpthread/man/pthread_mutex_trylock.3
+++ b/lib/libpthread/man/pthread_mutex_trylock.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 30, 1998
 .Dt PTHREAD_MUTEX_TRYLOCK 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_mutex_trylock
 .Nd attempt to lock a mutex without blocking
diff --git a/lib/libpthread/man/pthread_mutex_unlock.3 b/lib/libpthread/man/pthread_mutex_unlock.3
index e873be9904fa7..93e635496ec6c 100644
--- a/lib/libpthread/man/pthread_mutex_unlock.3
+++ b/lib/libpthread/man/pthread_mutex_unlock.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 30, 1998
 .Dt PTHREAD_MUTEX_UNLOCK 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_mutex_unlock
 .Nd unlock a mutex
diff --git a/lib/libpthread/man/pthread_once.3 b/lib/libpthread/man/pthread_once.3
index f3621d9a48943..736e32e94e2ee 100644
--- a/lib/libpthread/man/pthread_once.3
+++ b/lib/libpthread/man/pthread_once.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_ONCE 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_once
 .Nd dynamic package initialization
diff --git a/lib/libpthread/man/pthread_self.3 b/lib/libpthread/man/pthread_self.3
index 9723b5eebdc1d..acd46e9955b70 100644
--- a/lib/libpthread/man/pthread_self.3
+++ b/lib/libpthread/man/pthread_self.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_SELF 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_self
 .Nd get the calling thread's ID
diff --git a/lib/libpthread/man/pthread_setspecific.3 b/lib/libpthread/man/pthread_setspecific.3
index 698c3ca807c50..5265def7e7f18 100644
--- a/lib/libpthread/man/pthread_setspecific.3
+++ b/lib/libpthread/man/pthread_setspecific.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_SETSPECIFIC 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_setspecific
 .Nd set a thread-specific data value
diff --git a/lib/libradius/libradius.3 b/lib/libradius/libradius.3
index 56ee09da0cc3f..7f55a3a044e3f 100644
--- a/lib/libradius/libradius.3
+++ b/lib/libradius/libradius.3
@@ -26,7 +26,7 @@
 .\"
 .Dd October 30, 1999
 .Dt LIBRADIUS 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm libradius
 .Nd RADIUS client library
diff --git a/lib/libradius/radius.conf.5 b/lib/libradius/radius.conf.5
index 4ad3f8a7e5a77..d5ef42de752d4 100644
--- a/lib/libradius/radius.conf.5
+++ b/lib/libradius/radius.conf.5
@@ -26,7 +26,7 @@
 .\"
 .Dd October 30, 1999
 .Dt RADIUS.CONF 5
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm radius.conf
 .Nd RADIUS client configuration file
diff --git a/lib/libstand/libstand.3 b/lib/libstand/libstand.3
index 626cf710ec0d0..860438e1321af 100644
--- a/lib/libstand/libstand.3
+++ b/lib/libstand/libstand.3
@@ -26,7 +26,7 @@
 .\"
 .Dd June 22, 1998
 .Dt LIBSTAND 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm libstand
 .Nd support library for standalone executables
diff --git a/lib/libtacplus/libtacplus.3 b/lib/libtacplus/libtacplus.3
index ca83a8e00096e..713db0119d9ae 100644
--- a/lib/libtacplus/libtacplus.3
+++ b/lib/libtacplus/libtacplus.3
@@ -26,7 +26,7 @@
 .\"
 .Dd September 2, 1998
 .Dt LIBTACPLUS 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm libtacplus
 .Nd TACACS+ client library
diff --git a/lib/libtacplus/tacplus.conf.5 b/lib/libtacplus/tacplus.conf.5
index 315c06572b8c2..be7af61338078 100644
--- a/lib/libtacplus/tacplus.conf.5
+++ b/lib/libtacplus/tacplus.conf.5
@@ -26,7 +26,7 @@
 .\"
 .Dd July 29, 1998
 .Dt TACPLUS.CONF 5
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm tacplus.conf
 .Nd TACACS+ client configuration file
diff --git a/lib/libutil/_secure_path.3 b/lib/libutil/_secure_path.3
index d4e316fed134e..082328d9bcc3a 100644
--- a/lib/libutil/_secure_path.3
+++ b/lib/libutil/_secure_path.3
@@ -20,7 +20,7 @@
 .\" $FreeBSD$
 .\"
 .Dd May 2, 1997
-.Os FreeBSD
+.Os
 .Dt _SECURE_PATH 3
 .Sh NAME
 .Nm _secure_path
diff --git a/lib/libutil/auth.conf.5 b/lib/libutil/auth.conf.5
index eb892c6fd616b..df1e8f9969baf 100644
--- a/lib/libutil/auth.conf.5
+++ b/lib/libutil/auth.conf.5
@@ -15,7 +15,7 @@
 .\"
 .Dd October 7, 1998
 .Dt AUTH.CONF 5
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm auth.conf
 .Nd authentication capability database
diff --git a/lib/libutil/login.conf.5 b/lib/libutil/login.conf.5
index 3d3df0fa759f3..64d49ab908d51 100644
--- a/lib/libutil/login.conf.5
+++ b/lib/libutil/login.conf.5
@@ -21,7 +21,7 @@
 .\"
 .Dd November 22, 1996
 .Dt LOGIN.CONF 5
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm login.conf
 .Nd login class capability database
diff --git a/lib/libutil/login_auth.3 b/lib/libutil/login_auth.3
index fb7039d7ee1c6..0499b89c5a3b9 100644
--- a/lib/libutil/login_auth.3
+++ b/lib/libutil/login_auth.3
@@ -20,7 +20,7 @@
 .\" $FreeBSD$
 .\"
 .Dd December 29, 1996
-.Os FreeBSD
+.Os
 .Dt LOGIN_AUTH 3
 .Sh NAME
 .\" .Nm authenticate
diff --git a/lib/libutil/login_cap.3 b/lib/libutil/login_cap.3
index 391d51f30e60c..97f7f54749e97 100644
--- a/lib/libutil/login_cap.3
+++ b/lib/libutil/login_cap.3
@@ -20,7 +20,7 @@
 .\" $FreeBSD$
 .\"
 .Dd December 27, 1996
-.Os FreeBSD
+.Os
 .Dt LOGIN_CAP 3
 .Sh NAME
 .Nm login_close ,
diff --git a/lib/libutil/login_class.3 b/lib/libutil/login_class.3
index f88583510a39d..16f994e7adaf6 100644
--- a/lib/libutil/login_class.3
+++ b/lib/libutil/login_class.3
@@ -20,7 +20,7 @@
 .\" $FreeBSD$
 .\"
 .Dd December 28, 1996
-.Os FreeBSD
+.Os
 .Dt LOGIN_CLASS 3
 .Sh NAME
 .Nm setclasscontext ,
diff --git a/lib/libutil/login_ok.3 b/lib/libutil/login_ok.3
index 7242acc88eb1a..817cc6bf0a9a2 100644
--- a/lib/libutil/login_ok.3
+++ b/lib/libutil/login_ok.3
@@ -20,7 +20,7 @@
 .\" $FreeBSD$
 .\"
 .Dd January 2, 1997
-.Os FreeBSD
+.Os
 .Dt LOGIN_OK 3
 .Sh NAME
 .Nm auth_ttyok ,
diff --git a/lib/libutil/login_times.3 b/lib/libutil/login_times.3
index bdf66f344b7aa..fff232aeb731c 100644
--- a/lib/libutil/login_times.3
+++ b/lib/libutil/login_times.3
@@ -20,7 +20,7 @@
 .\" $FreeBSD$
 .\"
 .Dd January 2, 1997
-.Os FreeBSD
+.Os
 .Dt LOGIN_TIMES 3
 .Sh NAME
 .Nm parse_lt ,
diff --git a/lib/libvgl/vgl.3 b/lib/libvgl/vgl.3
index a38746edebeb3..19a4a39180c35 100644
--- a/lib/libvgl/vgl.3
+++ b/lib/libvgl/vgl.3
@@ -27,7 +27,7 @@
 .\" $FreeBSD$
 .Dd November 7, 1999
 .Dt VGL 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm VGLBitmapAllocateBits ,
 .Nm VGLBitmapCopy ,
diff --git a/lib/msun/man/acosh.3 b/lib/msun/man/acosh.3
index b7d9f7b047c3d..0b4961fe6ec35 100644
--- a/lib/msun/man/acosh.3
+++ b/lib/msun/man/acosh.3
@@ -34,7 +34,7 @@
 .\"
 .Dd May 6, 1991
 .Dt ACOSH 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm acosh ,
 .Nm acoshf
diff --git a/lib/msun/man/asinh.3 b/lib/msun/man/asinh.3
index eb3f2f3616f4e..00e431356ad94 100644
--- a/lib/msun/man/asinh.3
+++ b/lib/msun/man/asinh.3
@@ -34,7 +34,7 @@
 .\"
 .Dd May 6, 1991
 .Dt ASINH 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm asinh ,
 .Nm asinhf
diff --git a/lib/msun/man/atanh.3 b/lib/msun/man/atanh.3
index 6e770b41944e9..95cea4dc9ecc9 100644
--- a/lib/msun/man/atanh.3
+++ b/lib/msun/man/atanh.3
@@ -34,7 +34,7 @@
 .\"
 .Dd May 6, 1991
 .Dt ATANH 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm atanh ,
 .Nm atanhf
diff --git a/lib/msun/man/erf.3 b/lib/msun/man/erf.3
index 89c7cb4bda78a..ba66892c20d1c 100644
--- a/lib/msun/man/erf.3
+++ b/lib/msun/man/erf.3
@@ -34,7 +34,7 @@
 .\"
 .Dd April 20, 1991
 .Dt ERF 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm erf ,
 .Nm erff ,
diff --git a/lib/msun/man/exp.3 b/lib/msun/man/exp.3
index d453b10600a0a..2ebaeb20f69a0 100644
--- a/lib/msun/man/exp.3
+++ b/lib/msun/man/exp.3
@@ -34,7 +34,7 @@
 .\"
 .Dd July 31, 1991
 .Dt EXP 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm exp ,
 .Nm expf ,
diff --git a/lib/msun/man/hypot.3 b/lib/msun/man/hypot.3
index a139e3931e45e..951e25355f6eb 100644
--- a/lib/msun/man/hypot.3
+++ b/lib/msun/man/hypot.3
@@ -34,7 +34,7 @@
 .\"
 .Dd May 6, 1991
 .Dt HYPOT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm hypot ,
 .Nm hypotf ,
diff --git a/lib/msun/man/ieee_test.3 b/lib/msun/man/ieee_test.3
index 44578daebba9e..61b6418bfeb1c 100644
--- a/lib/msun/man/ieee_test.3
+++ b/lib/msun/man/ieee_test.3
@@ -34,7 +34,7 @@
 .\"
 .Dd March 10, 1994
 .Dt IEEE_TEST 3
-.Os 
+.Os
 .Sh NAME
 .Nm logb ,
 .Nm logbf ,
diff --git a/lib/msun/man/j0.3 b/lib/msun/man/j0.3
index 2aa024749e139..e743149a4c733 100644
--- a/lib/msun/man/j0.3
+++ b/lib/msun/man/j0.3
@@ -34,7 +34,7 @@
 .\"
 .Dd April 19, 1991
 .Dt J0 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm j0 ,
 .Nm j0f ,
diff --git a/lib/msun/man/lgamma.3 b/lib/msun/man/lgamma.3
index 980099945cb89..eb3d34baafe4b 100644
--- a/lib/msun/man/lgamma.3
+++ b/lib/msun/man/lgamma.3
@@ -34,7 +34,7 @@
 .\"
 .Dd December 3, 1992
 .Dt LGAMMA 3
-.Os BSD 4.3
+.Os
 .Sh NAME
 .Nm lgamma ,
 .Nm lgammaf ,
diff --git a/share/man/man3/pthread_cleanup_pop.3 b/share/man/man3/pthread_cleanup_pop.3
index 3cefb61322997..38fc46ca05fd8 100644
--- a/share/man/man3/pthread_cleanup_pop.3
+++ b/share/man/man3/pthread_cleanup_pop.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 30, 1998
 .Dt PTHREAD_CLEANUP_POP 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cleanup_pop
 .Nd call the first cleanup routine
diff --git a/share/man/man3/pthread_cleanup_push.3 b/share/man/man3/pthread_cleanup_push.3
index 70ee964f6b96d..5cc2a1e0cb79f 100644
--- a/share/man/man3/pthread_cleanup_push.3
+++ b/share/man/man3/pthread_cleanup_push.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 30, 1998
 .Dt PTHREAD_CLEANUP_PUSH 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cleanup_push
 .Nd add a cleanup function for thread exit
diff --git a/share/man/man3/pthread_cond_broadcast.3 b/share/man/man3/pthread_cond_broadcast.3
index 5a5f1a8994594..f881886ed6cc2 100644
--- a/share/man/man3/pthread_cond_broadcast.3
+++ b/share/man/man3/pthread_cond_broadcast.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_BROADCAST 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_broadcast
 .Nd unblock all threads waiting for a condition variable
diff --git a/share/man/man3/pthread_cond_destroy.3 b/share/man/man3/pthread_cond_destroy.3
index fb93c07ea3d43..4ac17f951623c 100644
--- a/share/man/man3/pthread_cond_destroy.3
+++ b/share/man/man3/pthread_cond_destroy.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_DESTROY 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_destroy
 .Nd destroy a condition variable
diff --git a/share/man/man3/pthread_cond_init.3 b/share/man/man3/pthread_cond_init.3
index 4c7a637cede50..5339f38259a03 100644
--- a/share/man/man3/pthread_cond_init.3
+++ b/share/man/man3/pthread_cond_init.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_INIT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_init
 .Nd create a condition variable
diff --git a/share/man/man3/pthread_cond_signal.3 b/share/man/man3/pthread_cond_signal.3
index 540b84c8f4b4f..654d5a8031227 100644
--- a/share/man/man3/pthread_cond_signal.3
+++ b/share/man/man3/pthread_cond_signal.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_SIGNAL 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_signal
 .Nd unblock a thread waiting for a condition variable
diff --git a/share/man/man3/pthread_cond_timedwait.3 b/share/man/man3/pthread_cond_timedwait.3
index 1d0fe70d52048..b0c56e80fe3ac 100644
--- a/share/man/man3/pthread_cond_timedwait.3
+++ b/share/man/man3/pthread_cond_timedwait.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_TIMEDWAIT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_timedwait
 .Nd "wait on a condition variable for a specific amount of time"
diff --git a/share/man/man3/pthread_cond_wait.3 b/share/man/man3/pthread_cond_wait.3
index abe44c72565b3..e9fde91842f80 100644
--- a/share/man/man3/pthread_cond_wait.3
+++ b/share/man/man3/pthread_cond_wait.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 28, 1998
 .Dt PTHREAD_COND_WAIT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_cond_wait
 .Nd wait on a condition variable
diff --git a/share/man/man3/pthread_create.3 b/share/man/man3/pthread_create.3
index 2dae2a1f657ec..5f2d24ce8ed3c 100644
--- a/share/man/man3/pthread_create.3
+++ b/share/man/man3/pthread_create.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_CREATE 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_create
 .Nd create a new thread
diff --git a/share/man/man3/pthread_detach.3 b/share/man/man3/pthread_detach.3
index fed4483de8ef4..75c9d42f08c49 100644
--- a/share/man/man3/pthread_detach.3
+++ b/share/man/man3/pthread_detach.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_DETACH 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_detach
 .Nd detach a thread
diff --git a/share/man/man3/pthread_equal.3 b/share/man/man3/pthread_equal.3
index d08111038c8a2..be55e90b46ba0 100644
--- a/share/man/man3/pthread_equal.3
+++ b/share/man/man3/pthread_equal.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_EQUAL 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_equal
 .Nd compare thread IDs
diff --git a/share/man/man3/pthread_exit.3 b/share/man/man3/pthread_exit.3
index a21f6dc3a9ff2..5f6f75bd5212e 100644
--- a/share/man/man3/pthread_exit.3
+++ b/share/man/man3/pthread_exit.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_EXIT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_exit
 .Nd terminate the calling thread
diff --git a/share/man/man3/pthread_getspecific.3 b/share/man/man3/pthread_getspecific.3
index 4bcb0d9b50d95..c003f3fca8948 100644
--- a/share/man/man3/pthread_getspecific.3
+++ b/share/man/man3/pthread_getspecific.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_GETSPECIFIC 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_getspecific
 .Nd get a thread-specific data value
diff --git a/share/man/man3/pthread_join.3 b/share/man/man3/pthread_join.3
index 3a68895fc5f24..f8e8e18a2feaa 100644
--- a/share/man/man3/pthread_join.3
+++ b/share/man/man3/pthread_join.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_JOIN 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_join
 .Nd wait for thread termination
diff --git a/share/man/man3/pthread_key_create.3 b/share/man/man3/pthread_key_create.3
index dcafc0c521135..d1fb922169490 100644
--- a/share/man/man3/pthread_key_create.3
+++ b/share/man/man3/pthread_key_create.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_KEY_CREATE 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_key_create
 .Nd thread-specific data key creation
diff --git a/share/man/man3/pthread_key_delete.3 b/share/man/man3/pthread_key_delete.3
index 06447e07abc01..9baa5020f12bc 100644
--- a/share/man/man3/pthread_key_delete.3
+++ b/share/man/man3/pthread_key_delete.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_KEY_DELETE 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_key_delete
 .Nd delete a thread-specific data key
diff --git a/share/man/man3/pthread_mutex_destroy.3 b/share/man/man3/pthread_mutex_destroy.3
index 0bb44d01d075c..f7b915d828205 100644
--- a/share/man/man3/pthread_mutex_destroy.3
+++ b/share/man/man3/pthread_mutex_destroy.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 29, 1998
 .Dt PTHREAD_MUTEX_DESTROY 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_mutex_destroy
 .Nd free resources allocated for a mutex
diff --git a/share/man/man3/pthread_mutex_init.3 b/share/man/man3/pthread_mutex_init.3
index 7d25baf41b55d..42b3a26a61f94 100644
--- a/share/man/man3/pthread_mutex_init.3
+++ b/share/man/man3/pthread_mutex_init.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 29, 1998
 .Dt PTHREAD_MUTEX_INIT 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_mutex_init
 .Nd create a mutex
diff --git a/share/man/man3/pthread_mutex_lock.3 b/share/man/man3/pthread_mutex_lock.3
index 82dfaadf731b4..972d277eade43 100644
--- a/share/man/man3/pthread_mutex_lock.3
+++ b/share/man/man3/pthread_mutex_lock.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 30, 1998
 .Dt PTHREAD_MUTEX_LOCK 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_mutex_lock
 .Nd lock a mutex
diff --git a/share/man/man3/pthread_mutex_trylock.3 b/share/man/man3/pthread_mutex_trylock.3
index fa3bdf87a8c4b..143df146702c3 100644
--- a/share/man/man3/pthread_mutex_trylock.3
+++ b/share/man/man3/pthread_mutex_trylock.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 30, 1998
 .Dt PTHREAD_MUTEX_TRYLOCK 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_mutex_trylock
 .Nd attempt to lock a mutex without blocking
diff --git a/share/man/man3/pthread_mutex_unlock.3 b/share/man/man3/pthread_mutex_unlock.3
index e873be9904fa7..93e635496ec6c 100644
--- a/share/man/man3/pthread_mutex_unlock.3
+++ b/share/man/man3/pthread_mutex_unlock.3
@@ -29,7 +29,7 @@
 .\"
 .Dd July 30, 1998
 .Dt PTHREAD_MUTEX_UNLOCK 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_mutex_unlock
 .Nd unlock a mutex
diff --git a/share/man/man3/pthread_once.3 b/share/man/man3/pthread_once.3
index f3621d9a48943..736e32e94e2ee 100644
--- a/share/man/man3/pthread_once.3
+++ b/share/man/man3/pthread_once.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_ONCE 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_once
 .Nd dynamic package initialization
diff --git a/share/man/man3/pthread_self.3 b/share/man/man3/pthread_self.3
index 9723b5eebdc1d..acd46e9955b70 100644
--- a/share/man/man3/pthread_self.3
+++ b/share/man/man3/pthread_self.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_SELF 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_self
 .Nd get the calling thread's ID
diff --git a/share/man/man3/pthread_setspecific.3 b/share/man/man3/pthread_setspecific.3
index 698c3ca807c50..5265def7e7f18 100644
--- a/share/man/man3/pthread_setspecific.3
+++ b/share/man/man3/pthread_setspecific.3
@@ -32,7 +32,7 @@
 .\"
 .Dd April 4, 1996
 .Dt PTHREAD_SETSPECIFIC 3
-.Os BSD 4
+.Os
 .Sh NAME
 .Nm pthread_setspecific
 .Nd set a thread-specific data value
diff --git a/sys/netinet/libalias/libalias.3 b/sys/netinet/libalias/libalias.3
index 995d965dac584..e8bdefdfc4894 100644
--- a/sys/netinet/libalias/libalias.3
+++ b/sys/netinet/libalias/libalias.3
@@ -27,7 +27,7 @@
 .\"
 .Dd April 13, 2000
 .Dt LIBALIAS 3
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm libalias
 .Nd packet aliasing library for masquerading and network address translation