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 +527,32 @@
 		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+=	${GH_TUPLE:C@^([^:]*):([^:]*):([^:]*)((:[^:]*)?)@\3\4@}
+
+gh-get-latest-revisions:
+	@${ECHO_MSG} "--begin latest revisions--"; \
+		for tuple in ${GH_TUPLE}; do \
+			oIFS="$$IFS"; IFS=":"; set -- $$tuple; IFS="$$oIFS"; \
+			[ -n "$$4" ] && group=":$$4"; \
+			rev=`git ls-remote https://github.com/$$1/$$2.git HEAD | ${SED} -E "s/^(.......).*/\\1/g"`; \
+			echo "GH_TUPLE+=	$$1:$$2:$$rev$$group"; \
+		done; \
+		${ECHO_MSG} "--end latest revisions--"
+
+gh-get-changed-revisions:
+	@${ECHO_MSG} "--begin changed revisions--"; \
+		for tuple in ${GH_TUPLE}; do \
+			oIFS="$$IFS"; IFS=":"; set -- $$tuple; IFS="$$oIFS"; \
+			[ -n "$$4" ] && group=":$$4"; \
+			rev=`git ls-remote https://github.com/$$1/$$2.git HEAD | ${SED} -E "s/^(.......).*/\\1/g"`; \
+			[ $$3 != "$$rev" ] && \
+				echo "GH_TUPLE+=	$$1:$$2:$$rev$$group"; \
+		done; \
+		${ECHO_MSG} "--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%