require 'formula' class MySqlInstalled < Requirement def message; <<-EOS.undent MySQL is required to install. You can install this with Homebrew using: brew install mysql-connector-c For MySQL client libraries only. brew install mysql For MySQL server. Or you can use an official installer from: http://dev.mysql.com/downloads/mysql/ EOS end def satisfied? which 'mysql_config' end def fatal? true end end class Dbslayer < Formula homepage 'http://code.nytimes.com/projects/dbslayer/wiki' url 'http://code.nytimes.com/downloads/dbslayer-beta-12.tgz' version '0.12.b' sha1 'fbf1c5563a6ee45783e31f6b49612e64fc141186' depends_on MySqlInstalled.new def install system "./configure", "--prefix=#{prefix}" system "make" system "make install" end end