else:
                    print_status(package.name, 'no')
                if not package.optional:
                    required_failed.append(package)
            else:
                good_packages.append(package)
                if isinstance(package, setupext.OptionalBackendPackage):
                    if default_backend is None:
                        default_backend = package.name
    print_raw('')

    # Abort if any of the required packages can not be built.
    if required_failed:
        print_line()
        print_message(
            "The following required packages can not "
            "be built: %s" %
            ', '.join(x.name for x in required_failed))
        sys.exit(1)

    # Now collect all of the information we need to build all of the
    # packages.
    for package in good_packages:
        if isinstance(package, str):
            continue
        packages.extend(package.get_packages())
        namespace_packages.extend(package.get_namespace_packages())
        py_modules.extend(package.get_py_modules())
        ext = package.get_extension()
        if ext is not None:
            ext_modules.append(ext)
        data = package.get_package_data()

                except setupext.CheckFailed as e:
                    msg = str(e).strip()
                    if len(msg):
                        print_status(package.name, 'no  [%s]' % msg)
                    else:
                        print_status(package.name, 'no')
                    if not package.optional:
                        required_failed.append(package)
                else:
                    good_packages.append(package)
        print_raw('')

        # Abort if any of the required packages can not be built.
        if required_failed:
            print_line()
            print_message("The following required packages can not be built: "
                          "%s" % ", ".join(x.name for x in required_failed))
            for pkg in required_failed:
                msg = pkg.install_help_msg()
                if msg:
                    print_message(msg)
            sys.exit(1)

        # Now collect all of the information we need to build all of the
        # packages.
        for package in good_packages:
            packages.extend(package.get_packages())
            namespace_packages.extend(package.get_namespace_packages())
            py_modules.extend(package.get_py_modules())
            ext = package.get_extension()
            if ext is not None:
                ext_modules.append(ext)