diff --git a/[refs] b/[refs]
index e8a424bb8f30..35e729e834b5 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 631330afdf9d29fe84526653674e8e061389d8f6
+refs/heads/master: e8f5bdb02ce06925e7fc5916125bdebc533d4299
diff --git a/trunk/Makefile b/trunk/Makefile
index bddcb861b49b..1bb028317f2b 100644
--- a/trunk/Makefile
+++ b/trunk/Makefile
@@ -530,7 +530,7 @@ endif
 include $(srctree)/arch/$(ARCH)/Makefile
 
 # arch Makefile may override CC so keep this after arch Makefile is included
-NOSTDINC_FLAGS := -nostdinc -isystem $(shell $(CC) -print-file-name=include)
+NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 
 # warn about C99 declaration after statement