+# version.c's not really _phony_, but it does need to be generated each run.
+.PHONY: version.c
+version.c: hg-id
+ printf '%s' 'const char *version_string = "@VERSION@' > $@
+ -HG_ID=$$(cat hg-id); [ "$$HG_ID" ] && printf '%s' " ($${HG_ID})" >> $@
+ printf '%s\n' '";' >> $@
+
+.INTERMEDIATE: hg-id
+hg-id:
+ -( hg id | cut -f 1 -d ' ' ) 2>/dev/null > $@
+