1 files changed, 2 insertions, 2 deletions
diff --git a/Make.rules b/Make.rules
index 9fd4862..0f072d1 100644
--- a/Make.rules
+++ b/Make.rules
@@ -174,8 +174,8 @@ if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ),                 \
 #####
 # Handle options to gcc.
 
-c_flags		= -Wp,-MD,$(depfile),-MT,$@ $(CFLAGS_ALL) $(CFLAGS_EXTRA) \
-		  $(CFLAGS_$(notdir $@))
+c_flags		= -Wp,-MD,$(depfile),-MT,$@ $(CPPFLAGS) \
+		  $(CFLAGS_ALL) $(CFLAGS_EXTRA) $(CFLAGS_$(notdir $@))
 ld_flags	= $(LDFLAGS_ALL) $(LDFLAGS_EXTRA) $(LDFLAGS_$(notdir $@))
 
 #####