The GMutexLocker name is used in new glib. According to release notes the problem was fixed in 2.4.9. Source/WebCore/platform/graphics/gstreamer/WebKitWebSourceGStreamer.cpp:349:9: error: reference to <E2><80><98>GMutexLocker<E2><80><99> is ambiguous GMutexLocker locker(GST_OBJECT_GET_LOCK(src)); ^
*** This bug has been marked as a duplicate of bug 547324 ***