# bsd.port.mk |   12 +++++++++++-
# 1 file changed, 11 insertions(+), 1 deletion(-)
# svn status
M       share/mk/bsd.port.mk

Index: share/mk/bsd.port.mk
===================================================================
--- share/mk/bsd.port.mk	(revision 272089)
+++ share/mk/bsd.port.mk	(working copy)
@@ -1,6 +1,16 @@
 # $FreeBSD$
 
-PORTSDIR?=	/usr/ports
+.if !defined(PORTSDIR)
+PORTSDIR!=								\
+		until [ -e Mk/bsd.port.mk ]; do				\
+			if [ "$${PWD}" = "/" ]; then			\
+				echo /usr/ports;			\
+				exit 0;					\
+			fi;						\
+			cd ..;						\
+		done;							\
+		echo $${PWD};
+.endif
 BSDPORTMK?=	${PORTSDIR}/Mk/bsd.port.mk
 
 # Needed to keep bsd.own.mk from reading in /etc/src.conf