def self.build(extension, directory, dest_path, results)
if File.basename(extension) =~ /mkrf_conf/i then
cmd = "#{Gem.ruby} #{File.basename extension}"
cmd << " #{Gem::Command.build_args.join " "}" unless Gem::Command.build_args.empty?
run cmd, results
end
dest_path = '"' + dest_path + '"' if dest_path.include?(' ')
cmd = ENV['rake'] || "#{Gem.ruby} -rubygems #{Gem.bin_path('rake')}" rescue Gem.default_exec_format % 'rake'
cmd += " RUBYARCHDIR=#{dest_path} RUBYLIBDIR=#{dest_path}"
run cmd, results
results
end