diff -up webkitgtk-2.14.1/Source/WebCore/platform/gtk/UserAgentGtk.cpp.orig webkitgtk-2.14.1/Source/WebCore/platform/gtk/UserAgentGtk.cpp
--- webkitgtk-2.14.1/Source/WebCore/platform/gtk/UserAgentGtk.cpp.orig	2016-10-12 07:59:25.670057792 +0200
+++ webkitgtk-2.14.1/Source/WebCore/platform/gtk/UserAgentGtk.cpp	2016-10-12 08:01:06.251878684 +0200
@@ -85,6 +85,9 @@ static String buildUserAgentString(const UserAgentQuirks& quirks)
     else {
         uaString.append(platformForUAString());
         uaString.appendLiteral("; ");
+#if defined(USER_AGENT_GTK_DISTRIBUTOR_NAME) && USER_AGENT_GTK_DISTRIBUTOR_NAME
+        uaString.appendLiteral(USER_AGENT_GTK_DISTRIBUTOR_NAME "; ");
+#endif
         uaString.append(platformVersionForUAString());
     }