--- graphics/libGL/Makefile.common	(revision 432891)
+++ graphics/libGL/Makefile.common	(working copy)
@@ -118,6 +118,16 @@ 
 
 CONFIGURE_ARGS+=	--enable-osmesa
 
+# restrict llvm dependency to archs where it builds.
+# XXX MCL ok 20170126
+.if ${OPSYS} == DragonFly || \
+	(${OPSYS} == FreeBSD && \
+		(${ARCH} == amd64 || \
+		${ARCH} == i386))
+# XXX MCL test 20170127
+#.if ${OPSYS} == DragonFly || \
+#	(${OPSYS} == FreeBSD && \
+#		${ARCH_SUPPORTS_LLVM} == yes)
 # gallium
 BUILD_DEPENDS+= llvm${MESA_LLVM_VER}>=3.7.1_1:devel/llvm${MESA_LLVM_VER}
 .if ${COMPONENT:Mdri} != "" || ${COMPONENT:Mclover} != "" || ${COMPONENT:Megl} != ""
@@ -128,6 +138,7 @@ 
 
 CONFIGURE_ARGS+=--enable-gallium-llvm \
                 --enable-xvmc
+.endif
 
 .if ${PORT_OPTIONS:MTEXTURE}
 CONFIGURE_ARGS+=--enable-texture-float