config.mk: control
	sed -ne 's/^Version: /VERSION=/p; s/^Architecture: /ARCH=/p; s/^Package: /PKG=/p;' < $< > $@
	echo 'export VERSION ARCH PKG' >> $@

include config.mk

PKG_FILE = $(PKG)_$(VERSION)_$(ARCH).deb
export PKG_FILE

$(PKG_FILE): control
	equivs-build control

clean-equivs:
	rm -f control equivs-stamp

equivs-stamp: control
	$(MAKE) $(PKG_FILE)
	$(MAKE) install-equivs
	rm $(PKG_FILE)
	touch $@

.PHONY: install-equivs
install-equivs:
ifneq (0,$(shell id -u))
	sudo $(MAKE) PKG_FILE=$(PKG_FILE) MAKEFLAGS=$(MAKEFLAGS) $@
else
	dpkg -i $${PKG_FILE}
ifneq ($(REMOVE_EQUIVS_PACKAGE),)
	dpkg -r $${PKG_FILE%%_*}
endif
endif