http://www.freebsd.org/cgi/query-pr.cgi?pr=ports/171681

--- Makefile.orig	2012-08-05 13:06:49.000000000 -0400
+++ Makefile	2012-09-16 05:56:08.885054241 -0400
@@ -155,6 +155,8 @@
 GIT?= git
 SVN?= svn
 SUP?= csup
+RSYNC?= rsync
+RSYNC_FLAGS?= --recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --verbose
 PORTSNAP?= portsnap
 PORTSNAP_FLAGS?= -p ${.CURDIR}
 .if defined(SUPHOST)
@@ -172,6 +174,11 @@
 	@echo ">>> Updating ${.CURDIR} from CVS repository" ${CVSROOT}
 	@echo "--------------------------------------------------------------"
 	cd ${.CURDIR}; ${CVS} -R -q update -A -P -d -I!
+.elif defined(RSYNC_UPDATE) && defined(PORTS_RSYNC_SOURCE)
+	@echo "--------------------------------------------------------------"
+	@echo ">>> Updating with ${RSYNC} from ${PORTS_RSYNC_SOURCE}"
+	@echo "--------------------------------------------------------------"
+	@${RSYNC} ${RSYNC_FLAGS} ${PORTS_RSYNC_SOURCE}/ ${.CURDIR}/
 .elif exists(${.CURDIR}/.svn)
 	@echo "--------------------------------------------------------------"
 	@echo ">>> Updating ${.CURDIR} using Subversion"