Index: gettext-runtime/m4/po.m4
===================================================================
RCS file: /sources/gettext/gettext/gettext-runtime/m4/po.m4,v
retrieving revision 1.19
diff -u -r1.19 po.m4
--- gettext-runtime/m4/po.m4	19 Jun 2006 10:44:37 -0000	1.19
+++ gettext-runtime/m4/po.m4	7 Oct 2006 18:22:02 -0000
@@ -146,6 +146,10 @@
           DUMMYPOFILES=
           GMOFILES=
           for lang in $ALL_LINGUAS; do
+            if ! echo $lang | grep -qx "[a-z]\{2,3\}\(\|_[A-Z][A-Z]\)\(\|\.[a-Z]*\)\(\|@[a-Z]*\)" ; then
+              echo "Invalid language code \"$lang\""
+              exit 1
+            fi
             POFILES="$POFILES $srcdirpre$lang.po"
             UPDATEPOFILES="$UPDATEPOFILES $lang.po-update"
             DUMMYPOFILES="$DUMMYPOFILES $lang.nop"