-diff -urN linux-2.6.21.1.old/Makefile linux-2.6.21.1.dev/Makefile
---- linux-2.6.21.1.old/Makefile 2007-04-27 23:49:26.000000000 +0200
-+++ linux-2.6.21.1.dev/Makefile 2007-05-26 19:14:22.967804016 +0200
+--- a/Makefile
++++ b/Makefile
@@ -507,6 +507,9 @@
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
CHECKFLAGS += $(NOSTDINC_FLAGS)