X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=Makefile;h=0596ba6a5739187669fdd42eb1f1d9b452bc775a;hb=df8bc51660941d7464dcd31170690519cb95c0c2;hp=acdb23d2f94672f4d7b02b8babc34e7df9bd7029;hpb=ab20cf481c19c7a240d3e27d556bafe281d17f5b;p=gnulib.git

diff --git a/Makefile b/Makefile
index acdb23d2f..0596ba6a5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 # Makefile for gnulib central.
-# Copyright (C) 2006, 2009 Free Software Foundation, Inc.
+# Copyright (C) 2006, 2009, 2010 Free Software Foundation, Inc.
 #
 # Copying and distribution of this file, with or without modification,
 # in any medium, are permitted without royalty provided the copyright
@@ -13,7 +13,14 @@ info html dvi pdf:
 	cd doc && $(MAKE) $@ && $(MAKE) mostlyclean
 
 # Perform some platform independent checks on the gnulib code.
-check:
+check: sc_prefer_ac_check_funcs_once
+
+sc_prefer_ac_check_funcs_once:
+	if test -d .git; then						\
+          git grep -w -l AC_CHECK_FUNCS modules				\
+            && { echo use AC_CHECK_FUNCS_ONCE, not AC_CHECK_FUNCS	\
+                   in modules/ 1>&2; exit 1; } || :			\
+	else :; fi
 
 # Regenerate some files that are stored in the repository.
 regen: MODULES.html