--- a/libbridge/Makefile.in
+++ b/libbridge/Makefile.in
@@ -5,7 +5,7 @@
RANLIB=@RANLIB@
CC=@CC@
-CFLAGS = -Wall -g $(KERNEL_HEADERS)
+CFLAGS = @CFLAGS@ -Wall -g $(KERNEL_HEADERS)
prefix=@prefix@
exec_prefix=@exec_prefix@