--- Makefile.in
+++ Makefile.in
@@ -283,7 +283,7 @@
 AWK = @AWK@
 CC = @CC@
 CCDEPMODE = @CCDEPMODE@
-CFLAGS = @CFLAGS@
+CFLAGS = @CFLAGS@ $(EXTRA_CFLAGS)
 CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
 CYGPATH_W = @CYGPATH_W@