prepare:
	wget -O flex.tar.gz https://github.com/westes/flex/releases/download/v2.6.4/flex-2.6.4.tar.gz
	tar -xf flex.tar.gz
	cd flex
$(MAKE):
	@./configure \
		--prefix=/usr \
		ac_cv_func_malloc_0_nonnull=yes \
		ac_cv_func_realloc_0_nonnull=yes

	$(MAKE)
install:
	$(MAKE) install DESTDIR="${PREFIX}"
	ln -s flex "$1/usr/bin/lex"
uninstall:
	$(MAKE) uninstall