CocoaPods経由で入れたMagicalRecordのログを非表示にするPodfileの書き方

Podfile

platform :ios, '5.0'

pod 'MagicalRecord'

post_install do |installer|
  installer.project.targets.each do |target|
    target.build_configurations.each do |config|
      s = config.build_settings['GCC_PREPROCESSOR_DEFINITIONS']
    if s==nil then s = [ '$(inherited)' ] end
    s.push('MR_ENABLE_ACTIVE_RECORD_LOGGING=0');
      config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] = s
    end
  end
end