Index: Mk/bsd.port.mk
===================================================================
--- Mk/bsd.port.mk
+++ Mk/bsd.port.mk
@@ -1585,6 +1585,9 @@
 WRKSRC:=		${WRKSRC}/${WRKSRC_SUBDIR}
 .endif
 
+# Remove duplicate / from WRKSRC.
+WRKSRC:=			${WRKSRC:C/\/\/*/\//g}
+
 .if defined(CONFIGURE_OUTSOURCE)
 CONFIGURE_CMD?=		${WRKSRC}/${CONFIGURE_SCRIPT}
 CONFIGURE_WRKSRC?=	${WRKDIR}/.build