use QT_VERSION for new features - more; refs #160

src/browser.hxx

@@ -1317,11 +1317,13 @@ class Browser: public QMainWindow, protected Ui::Browser {
     void unsupportedContent(QNetworkReply* reply) {
       TRC; LOG<<reply->header(QNetworkRequest::ContentTypeHeader).toString();
       LOG<<"Status:"<<_downloadManager->networkError(reply->error());
+#if QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)
       QList<QNetworkReply::RawHeaderPair> rh(reply->rawHeaderPairs());
       for(QList<QNetworkReply::RawHeaderPair>::iterator it(rh.begin());
           it!=rh.end(); ++it) {
         LOG<<"RawHeader:"<<it->first<<it->second;
       }
+#endif
       handleContent(reply);
     }