require 'formula' class Bison < Formula homepage 'http://www.gnu.org/software/bison/' url 'http://ftpmirror.gnu.org/bison/bison-2.7.tar.gz' mirror 'http://ftp.gnu.org/gnu/bison/bison-2.7.tar.gz' sha1 'aa4f5aa51ee448bac132041df0ce25a800a3661c' 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