VERSIONS = 21.4a 22.1 22.2 22.3 23.1 23.2b 23.3b 23.4 24.1 24.2 24.3 24.4 24.5
STABLE_TARGETS = $(addprefix prepare-emacs-,$(VERSIONS))

.PHONY: prepare-emacs-24 prepare-emacs-git $(STABLE_TARGETS) \
        prepare-emacs before_install install script

$(STABLE_TARGETS):
	curl -o /tmp/$(EMACS_TARGET).tar.gz "https://ftp.gnu.org/gnu/emacs/$(EMACS_TARGET).tar.gz"
	mkdir /tmp/emacs-tmp
	tar xzf /tmp/$(EMACS_TARGET).tar.gz -C /tmp/emacs-tmp
	mv /tmp/emacs-tmp/* "/tmp/emacs" || (ls /tmp/*; exit 1)

prepare-emacs-git:
	git clone --depth=1 'http://git.sv.gnu.org/r/emacs.git' /tmp/emacs
	cd /tmp/emacs && ./autogen.sh

prepare-emacs: prepare-$(EMACS_TARGET)
	cd /tmp/emacs && ./configure --prefix="$(HOME)" --without-all --with-x-toolkit=no --without-x --with-xml2 && make -j2 install

before_install: prepare-emacs

install:

script:
	make

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