File disable-update-check.patch of Package mkvtoolnix
diff -Nur mkvtoolnix-8.7.0/src/mkvtoolnix-gui/main_window/main_window.cpp mkvtoolnix-8.7.0-new/src/mkvtoolnix-gui/main_window/main_window.cpp
--- mkvtoolnix-8.7.0/src/mkvtoolnix-gui/main_window/main_window.cpp 2015-12-31 13:23:52.000000000 +0100
+++ mkvtoolnix-8.7.0-new/src/mkvtoolnix-gui/main_window/main_window.cpp 2016-01-07 17:18:38.161440704 +0100
@@ -68,7 +68,8 @@
jobTool()->loadAndStart();
-#if defined(HAVE_CURL_EASY_H)
+// No update check on system with package management system
+#if 0
silentlyCheckForUpdates();
#endif // HAVE_CURL_EASY_H
@@ -124,7 +125,8 @@
connect(this, &MainWindow::preferencesChanged, this, &MainWindow::setToolSelectorVisibility);
-#if defined(HAVE_CURL_EASY_H)
+// No update check on a package management system
+#if 0
connect(ui->actionHelpCheckForUpdates, &QAction::triggered, this, &MainWindow::checkForUpdates);
#else
ui->actionHelpCheckForUpdates->setVisible(false);