diff --git a/tools/Makefile.gnuhost b/tools/Makefile.gnuhost
index b6b25d31e255..51ec5465b132 100644
--- a/tools/Makefile.gnuhost
+++ b/tools/Makefile.gnuhost
@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile.gnuhost,v 1.19 2003/07/18 08:26:12 lukem Exp $
+#	$NetBSD: Makefile.gnuhost,v 1.20 2003/10/07 14:12:36 dbj Exp $
 #
 # Rules used when building a GNU host package.  Expects MODULE to be set.
 #
@@ -17,6 +17,12 @@
 
 .include <bsd.own.mk>
 
+# Disable use of pre-compiled headers on Darwin.
+BUILD_OSTYPE!=  uname -s
+.if ${BUILD_OSTYPE} == "Darwin"
+HOST_CFLAGS+=	-no-cpp-precomp
+.endif
+
 GNUHOSTDIST?=	${.CURDIR}/../../gnu/dist/${MODULE}
 
 FIND_ARGS+=	\! \( -type d \( \