name) { 'xml' => '--enable-xml', 'soap' => '--enable-soap', 'xmlreader' => '--enable-xmlreader', 'xmlwriter' => '--enable-xmlwriter', 'dom' => '--enable-dom', 'simplexml' => '--enable-simplexml', default => throw new RuntimeException('Not accept non-xml extension'), }; $arg .= ' --with-libxml="' . BUILD_ROOT_PATH . '"'; return $arg; } }