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diff --git a/CHANGES b/CHANGES
index 720ee8336fb8..46d009758c89 100644
--- a/CHANGES
+++ b/CHANGES
@@ -10,6 +10,36 @@ in the release notes and/or placed into UPDATING.
All ports committers are allowed to commit to this file.
+20140930:
+AUTHOR: bdrewery@FreeBSD.org
+
+ Building ports in a chroot or jail have always required a particular
+ environment be setup. This was not clear though and the ports framework
+ did not enforce it. These requirements are:
+ 1. Either a SRC_BASE/sys/sys/param.h, or /usr/include/sys/param.h be
+ present with the __FreeBSD_version_ number of the target system,
+ or OSVERSION be set in the environment. Lack of these would fallback
+ on kern.osreldate before, which is no longer the case.
+ 2. UNAME_r,UNAME_v,UNAME_s all must be set for the target system.
+
+ Not having these values in sync will now cause the build to error until it is
+ resolved.
+
+ Setting these in the environment can be done via your own wrapper scripts,
+ or /etc/login.conf (along with cap_mkdb /etc/login.conf) or
+ via /etc/make.conf using appropriate values. Note that OSVERSION is redundant
+ if a proper param.h is in the environment:
+
+ OSVERSION+= 1100036
+ UNAME_ENV+= OSVERSION=${OSVERSION}
+ UNAME_ENV+= UNAME_s=FreeBSD
+ UNAME_ENV+= UNAME_r=11.0-CURRENT
+ UNAME_ENV+= UNAME_v="${UNAME_s} ${UNAME_r}"
+ .MAKEFLAGS: ${UNAME_ENV}
+ MAKE_ENV+= ${UNAME_ENV}
+ CONFIGURE_ENV+= ${UNAME_ENV}
+ SCRIPTS_ENV+= ${UNAME_ENV}
+
20140922:
AUTHOR: bapt@FreeBSD.org