The fix for 6913179 introduced support for native GTK FileDialog. However, it also requires some functions from the libgthreads library that actually exist in newer versions of GTK only. For instance, the g_thread_get_initialized symbol is requested while it's only available since gtk 2.20.

Since this function gets invoked when the GTK is initialized by JDK, the initialization fails, and any Swing application requesting the GTK L&F fails.