2 files changed, 13 insertions, 1 deletions

diff --git a/gnu/usr.bin/diff/Makefile b/gnu/usr.bin/diff/Makefile
index 75d8c48513a0..58818cb7be5c 100644
--- a/gnu/usr.bin/diff/Makefile
+++ b/gnu/usr.bin/diff/Makefile
@@ -4,7 +4,7 @@
 
 PROG=	diff
 SRCS=	diff.c analyze.c io.c context.c ed.c normal.c ifdef.c util.c dir.c \
-	version.c getopt.c getopt1.c side.c cmpbuf.c
+	version.c getopt.c getopt1.c side.c cmpbuf.c prepend_args.c
 
 # Important for ctype macros!
 CFLAGS+=-funsigned-char
diff --git a/gnu/usr.bin/diff/diff.1 b/gnu/usr.bin/diff/diff.1
index d08333349a47..cbad443f519a 100644
--- a/gnu/usr.bin/diff/diff.1
+++ b/gnu/usr.bin/diff/diff.1
@@ -1,3 +1,4 @@
+.\" $FreeBSD$
 .TH DIFF 1 "22sep1993" "GNU Tools" "GNU Tools"
 .SH NAME
 diff \- find differences between two files
@@ -297,6 +298,9 @@ Use
 to output a line taken from just the second file in
 if-then-else format.
 .TP
+.B \-o
+Use the old traditional output format.
+.TP
 .BI \-\-old\-group\-format= format
 Use
 .I format
@@ -463,6 +467,14 @@ match any pattern contained in
 .TP
 .B \-y
 Use the side by side output format.
+.SH ENVIRONMENT
+The environment variable
+.B DIFF_OPTIONS
+can hold a set of default
+options for
+.I diff.
+These options are interpreted first and can be overwritten by explicit command
+line parameters.
 .SH EXAMPLES
 To save to a file some changes that you have made to your local source
 tree (possibly including new files), which you would like to show to others