--- gnulib/build-aux/do-release-commit-and-tag	2011-10-19 22:37:21.000000000 +0700
+++ gl/build-aux/do-release-commit-and-tag	2011-10-21 15:09:12.000000000 +0700
@@ -74,6 +74,10 @@
   esac
 }
 
+for gsort in $SORT gsort sort; do
+  echo 1|$gsort -V >/dev/null 2>/dev/null && break
+done
+
 branch=master
 case $1 in
   --branch) shift; branch=$1; shift ;;
@@ -95,7 +99,7 @@
   || die 'failed to determine previous version number from .prev-version'
 
 # Verify that $ver is sensible (> .prev-version).
-case $(printf "$prev_ver\n$ver\n"|sort -V -u|tr '\n' ':') in
+case $(printf "$prev_ver\n$ver\n"|$gsort -V -u|tr '\n' ':') in
   "$prev_ver:$ver:") ;;
   *) die "invalid version: $ver";;
 esac