+frontend/%.o: CFLAGS += -Wall -DIN_EVDEV
+frontend/menu.o: frontend/revision.h
+
+frontend/revision.h: FORCE
+ @(git describe || echo) | sed -e 's/.*/#define REV "\0"/' > $@_
+ @diff -q $@_ $@ > /dev/null 2>&1 || cp $@_ $@
+ @rm $@_
+.PHONY: FORCE
+