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 Pgtap < Formula url 'http://pgfoundry.org/frs/download.php/2701/pgtap-0.24.tar.bz2' homepage 'http://pgtap.org' sha1 '8a23fe62e1e476731076a588cb628fe9f1a028b1' depends_on PostgresqlInstalled.new skip_clean :all def install system "make install" bin.install %w(bbin/pg_prove bbin/pg_tapgen) end end