class Rake::ExtensionTask

def define
  super
  unless compiled_files.empty?
    warn "WARNING: rake-compiler found compiled files in '#{@ext_dir}' directory. Please remove them."
  end
  # only gems with 'ruby' platforms are allowed to define native tasks
  define_native_tasks if !@no_native && (@gem_spec && @gem_spec.platform == 'ruby')
  # only define cross platform functionality when enabled
  return unless @cross_compile
  if cross_platform.is_a?(Array) then
    cross_platform.each { |platf| define_cross_platform_tasks(platf) }
  else
    define_cross_platform_tasks(cross_platform)
  end
end