(hello:32591): Gtk-WARNING **: Locale not supported by C library.
        Using the fallback 'C' locale.

Program received signal SIGSEGV, Segmentation fault.
0x77edbc81 in gtk_widget_show () from /usr/lib/libgtk-x11-2.0.so.0
(gdb) bt
#0  0x77edbc81 in gtk_widget_show () from /usr/lib/libgtk-x11-2.0.so.0
#1  0x08048a67 in changer ()
#2  0x778f3423 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0
#3  0x778e779f in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#4  0x778f62ea in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0
#5  0x778f7b19 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#6  0x778f7e89 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#7  0x77d3249f in gtk_button_clicked () from /usr/lib/libgtk-x11-2.0.so.0
#8  0x77d33cda in _gtk_button_set_depressed () from /usr/lib/libgtk-x11-2.0.so.0
#9  0x778f3423 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0
#10 0x778e716f in g_cclosure_new_swap () from /usr/lib/libgobject-2.0.so.0
#11 0x778e779f in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#12 0x778f65cc in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0
#13 0x778f7b19 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#14 0x778f7e89 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#15 0x77d3241c in gtk_button_released () from /usr/lib/libgtk-x11-2.0.so.0
#16 0x77d3338c in _gtk_button_paint () from /usr/lib/libgtk-x11-2.0.so.0
#17 0x77df38f0 in _gtk_marshal_BOOLEAN__BOXED () from /usr/lib/libgtk-x11-2.0.so.0
#18 0x778e716f in g_cclosure_new_swap () from /usr/lib/libgobject-2.0.so.0
#19 0x778e779f in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#20 0x778f69ce in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0
#21 0x778f7886 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#22 0x778f7e89 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#23 0x77ed5dbf in gtk_widget_activate () from /usr/lib/libgtk-x11-2.0.so.0
#24 0x77df206d in gtk_propagate_event () from /usr/lib/libgtk-x11-2.0.so.0
#25 0x77df247b in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0
#26 0x77b72dec in _gdk_events_queue () from /usr/lib/libgdk-x11-2.0.so.0
#27 0x778768d6 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#28 0x77879996 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#29 0x77879cb8 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#30 0x77df1775 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#31 0x080489d6 in main ()
(gdb)