Index: Makefile
===================================================================
--- Makefile	(revision 341832)
+++ Makefile	(working copy)
@@ -41,8 +41,10 @@
 
 PLIST_SUB+=	VERSION=${MESADISTVERSION}
 
+DIR_DRIVERS=	# empty for unsupported arches
+
 .if ${ARCH} == amd64 || ${ARCH} == i386 || ${ARCH} == ia64
-DRI_DRIVERS=	${ALL_DRI_DRIVERS}
+DRI_DRIVERS+=	${ALL_DRI_DRIVERS}
 .endif
 
 .if defined(WITH_NEW_XORG)