Document _POSIX2_VERSION.

1 files changed, 7 insertions, 3 deletions

diff --git a/old/textutils/NEWS b/old/textutils/NEWS
index 7cbaa5a14..fab67541e 100644
--- a/old/textutils/NEWS
+++ b/old/textutils/NEWS
@@ -3,7 +3,11 @@ Changes in release 2.1
 * split accepts new option -a or --suffix-length.
 * split no longer generates longer suffixes than requested; instead, it reports
   an error when suffixes are exhausted.  POSIX requires this behavior.
-* The following obsolete usages are no longer supported on systems conforming
+* The _POSIX2_VERSION environment variable lets you select which version
+  of POSIX the utilities should conform to.  Its default value is system
+  dependent.  Set _POSIX2_VERSION=199209 to cause the utilities to support
+  obsolete usage like "sort +1".
+* The following obsolete usages are no longer supported when conforming
   to POSIX 1003.1-2001, which prohibits most digit-string options:
     expand -N	(instead, use expand -t N)
     head -N	(instead, use head -c N or head -n N)
@@ -13,14 +17,14 @@ Changes in release 2.1
     unexpand -N	(instead, use unexpand --first-only -t N)
     uniq -N	(instead, use uniq -f N)
   The following obsolete usages (options without arguments) are no
-  longer supported on systems conforming to POSIX 1003.1-2001, which
+  longer supported when conforming to POSIX 1003.1-2001, which
   prohibits most options with optional arguments:
     od -s	(instead, use od --strings)
     od -w	(instead, use od --width)
     pr -S	(instead, use pr --sep-string)
 [2.0.20]
 * tr no longer gets failed a assertion for [==] or [::]
-* The following obsolete usages are no longer supported on systems conforming
+* The following obsolete usages are no longer supported when conforming
   to POSIX 1003.1-2001, which prohibits most options with leading "+":
     sort +POS1 -POS2	(instead, use sort -k)
     tail +N		(instead, use tail -c +N or tail -n +N)