require 'formula' class PostgresqlInstalled < Requirement def message; <<-EOS.undent PostgresQL is required to install. You can install this with: brew install postgresql Or you can use an official installer from: http://www.postgresql.org/ EOS end def satisfied? which 'pg_config' end def fatal? true end end class PgpoolIi < Formula homepage 'http://www.pgpool.net/mediawiki/index.php/Main_Page' url 'http://pgfoundry.org/frs/download.php/2841/pgpool-II-3.0.7.tar.gz' sha1 '1c72a271d65bd7b44b473b5020746808a056bf3d' depends_on PostgresqlInstalled.new def install system "./configure", "--prefix=#{prefix}", "--mandir=#{man}" system "make install" end end