+VERSION_SH = $(SRC_PATH_BARE)/version.sh
+GIT_LOG = $(SRC_PATH_BARE)/.git/logs/HEAD
+SVN_ENTRIES = $(SRC_PATH_BARE)/.svn/entries
+
+.version: $(wildcard $(GIT_LOG) $(SVN_ENTRIES)) $(VERSION_SH) config.mak
+.version: M=@
+
+version.h .version:
+ $(M)$(VERSION_SH) $(SRC_PATH) version.h $(EXTRA_VERSION)
+ $(Q)touch .version
+
+# force version.sh to run whenever version might have changed
+-include .version