Index: bsd.port.mk
===================================================================
RCS file: /home/pcvs/ports/Mk/bsd.port.mk,v
retrieving revision 1.699
diff -u -r1.699 bsd.port.mk
--- bsd.port.mk	9 Nov 2011 08:53:12 -0000	1.699
+++ bsd.port.mk	9 Jan 2012 18:04:43 -0000
@@ -1202,7 +1202,7 @@
 
 .if ${MASTERDIR} != ${.CURDIR}
 SLAVE_PORT?=	yes
-MASTER_PORT?=${MASTERDIR:C/[^\/]+\/\.\.\///:C/[^\/]+\/\.\.\///:C/^.*\/([^\/]+\/[^\/]+)$/\\1/}
+MASTER_PORT?=${MASTERDIR:C,[^/]+/\.\./,,:C,[^/]+/\.\./,,:C,^.*/([^/]+/[^/]+)/?$,\\1,}
 .else
 SLAVE_PORT?=	no
 MASTER_PORT?=