builder_for

# File lib/rubygems/ext/builder.rb, line 119
  def builder_for(extension) # :nodoc:
    case extension
    when /extconf/ then
      Gem::Ext::ExtConfBuilder
    when /configure/ then
      Gem::Ext::ConfigureBuilder
    when /rakefile/, /mkrf_conf/ then
      @ran_rake = true
      Gem::Ext::RakeBuilder
    when /CMakeLists.txt/ then
      Gem::Ext::CmakeBuilder
    else
      extension_dir = File.join @gem_dir, File.dirname(extension)

      message = "No builder for extension '#{extension}'"
      build_error extension_dir, message
    end
  end