EMACS = /usr/bin/emacs

define tangle =
	@echo -e "\e[35mOBT\e[0m" $<
	@$(EMACS) -batch \
        -eval "(package-initialize)" \
        -load ob-tangle \
        -eval "(org-babel-tangle-file \"$<\" \"$(notdir $@)\" \"$(1)\")"
endef