--- Makefile.pre.in.orig	2006-10-08 10:41:25.000000000 -0700
+++ Makefile.pre.in	2007-04-20 18:06:11.000000000 -0700
@@ -56,7 +56,7 @@
 OPT=		@OPT@
 BASECFLAGS=	@BASECFLAGS@
 CFLAGS=		$(BASECFLAGS) $(OPT)
-CPPFLAGS=	-I. -I$(srcdir)/Include
+CPPFLAGS=	@CPPFLAGS@ -I. -I$(srcdir)/Include
 LDFLAGS=	@LDFLAGS@
 LDLAST=		@LDLAST@
 SGI_ABI=	@SGI_ABI@
