diff -ru /usr/ports/multimedia/vlc/Makefile vlc/Makefile
--- /usr/ports/multimedia/vlc/Makefile	2009-11-28 18:49:17.000000000 -0500
+++ vlc/Makefile	2009-12-01 04:29:54.000000000 -0500
@@ -98,8 +98,10 @@
 
 .include <bsd.port.pre.mk>
 
+# FreeBSD 6 still uses sys/mount.h, but recent autoconf doesn't like it
+# Pass as CFLAGS to skirt autoconfs second guessing
 .if (${OSVERSION} < 701000)
-CONFIGURE_ENV+=	HAS_SYS_MOUNT_H="1"
+CFLAGS+=-DHAVE_SYS_MOUNT_H
 .endif
 
 WITH_VLC_DEFAULT_FONT?=	${LOCALBASE}/lib/X11/fonts/bitstream-vera/Vera.ttf