diff -r 00739d74c495 sys/dev/aic7xxx/aicasm/Makefile
--- sys/dev/aic7xxx/aicasm/Makefile	Sat Sep 14 09:55:04 2013 -0600
+++ sys/dev/aic7xxx/aicasm/Makefile	Sat Sep 14 11:44:09 2013 -0600
@@ -24,7 +24,8 @@ WARNS?=	5
 DEPENDFILE=	.depend_aicasm
 .endif
 
-CFLAGS+= -I.
+# Tool runs on the build host, must prefer /usr/include headers over obj/...
+CFLAGS+= -I/usr/include -I.
 .ifdef MAKESRCPATH
 CFLAGS+= -I${MAKESRCPATH}
 .endif