--- x11/xlockmore/Makefile.orig	2007-10-17 12:41:25.000000000 +0200
+++ x11/xlockmore/Makefile	2008-03-06 16:01:51.000000000 +0100
@@ -50,11 +50,10 @@
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} == amd64
-WITH_MESAGL=	no
-.else
-WITH_MESAGL?=	yes
+.undef WITH_MESAGL
 .endif
-.if ${WITH_MESAGL} == yes
+
+.if defined(WITH_MESAGL)
 CONFIGURE_ARGS+=	--with-mesa
 MESALIB=${PTHREAD_LIBS}
 USE_GL=	yes