.tags: $(shell git ls-files | egrep '\.[hc]$$')
ctags -o $@ $^
-headers: HEADACHEOPTS=-c mk/headache.cfg -h COPYING
+headers: HEADACHEOPTS=-c mk/headache.cfg -h mk/COPYING
headers:
@which headache > /dev/null || \
( echo "package headache not installed" ; exit 1 )