Index: Mk/bsd.sites.mk
===================================================================
--- Mk/bsd.sites.mk
+++ Mk/bsd.sites.mk
@@ -519,6 +519,7 @@
 #                 Using the name of a branch here is incorrect. It is
 #                 possible to do GH_TAGNAME= GIT_HASH to do a snapshot.
 #                 default: ${DISTVERSION}
+# GH_TUPLE      - above shortened to account:project:tagname[:group]
 #
 .if defined(USE_GITHUB)
 .  if defined(GH_TAGNAME) && ${GH_TAGNAME} == master
@@ -526,6 +527,35 @@
 		Must use a tag or commit hash so the upstream does \
 		not "reroll" as soon as the branch is updated
 .  endif
+.  if defined(GH_TUPLE)
+GH_ACCOUNT+=	${GH_TUPLE:C@^([^:]*):([^:]*):([^:]*)((:[^:]*)?)@\1\4@}
+GH_PROJECT+=	${GH_TUPLE:C@^([^:]*):([^:]*):([^:]*)((:[^:]*)?)@\2\4@}
+GH_TAGNAME+=	${GH_TUPLE:C@^([^:]*):([^:]*):([^:]*)((:[^:]*)?)@\3\4@}
+
+.for _TUPLE_TMP in ${GH_TUPLE}
+_TUPLE=${_TUPLE_TMP}
+_ACCOUNT=	${GH_TUPLE:C@^([^:]*):([^:]*):([^:]*)((:[^:]*)?)@\1@}
+_PROJECT=	${GH_TUPLE:C@^([^:]*):([^:]*):([^:]*)((:[^:]*)?)@\2@}
+_TAGNAME=	${GH_TUPLE:C@^([^:]*):([^:]*):([^:]*)((:[^:]*)?)@\3@}
+_GROUP=		${GH_TUPLE:C@^([^:]*):([^:]*):([^:]*)((:[^:]*)?)@\4@:C@-@_@g}
+_GROUP2=	${_GROUP:C/^://}
+_GIT_REV_GET+=	GIT_REV_${_GROUP2}=`git ls-remote https://github.com/${_ACCOUNT}/${_PROJECT}.git HEAD | ${SED} -E "s/^(.......).*/\\1/g"` && 
+_GIT_REV_ECHO+=	echo "GH_TUPLE+=	${_ACCOUNT}:${_PROJECT}:$${GIT_REV_${_GROUP2}}${_GROUP}" && 
+_GIT_REV_CHANGE+=if [ ${_TAGNAME} != "\$$GIT_REV_${_GROUP2}" ]; then echo "GH_TUPLE+=	${_ACCOUNT}:${_PROJECT}:$${GIT_REV_${_GROUP2}}${_GROUP}"; fi && 
+.endfor
+
+gh-get-latest-revisions:
+	@${ECHO} "--begin latest revisions--" && \
+		${_GIT_REV_GET} \
+		${_GIT_REV_ECHO} \
+	${ECHO} "--end latest revisions--"
+
+gh-get-changed-revisions:
+	@${ECHO} "--begin changed revisions--" && \
+		${_GIT_REV_GET} \
+		${_GIT_REV_CHANGE} \
+	${ECHO} "--end changed revisions--"
+.  endif
 # We are cheating and using backend URLS for Github here. See ports/194898
 # comment #15 for explanation as to why and how to deal with it if it breaks.
 MASTER_SITE_GITHUB+=		https://codeload.github.com/%SUBDIR%