require 'formula' class Bison < Formula homepage 'http://www.gnu.org/software/bison/' url 'http://ftpmirror.gnu.org/bison/bison-3.0.tar.gz' mirror 'http://ftp.gnu.org/gnu/bison/bison-3.0.tar.gz' sha1 'e2da7ecd4ab65a12effe63ffa3ff5e7da34d9a72' keg_only :provided_by_osx, 'Some formulae require a newer version of bison.' def install system "./configure", "--disable-dependency-tracking", "--prefix=#{prefix}" system "make", "install" end end