Steps to reproduce:
1. On x86_64 left-click the nm-applet icon
2. Do "Connect to Other Wireless Network..."
3. Applet disappears (from a terminal/gdb, a segmentation fault is reported)


Stack trace:
StacktraceTop:IA__gtk_combo_box_set_model (combo_box=0x2aaaac055690, model=0xffffffffac058480) at /build/buildd/gtk+2.0-2.11.5/gtk/gtkcombobox.c:4815
wso_wpa_eap_new (glade_file=<value optimized out>, capabilities=61647, wpa2=1) at wso-wpa-eap.c:297
wsm_set_capabilities (wsm=0xbb0d90, capabilities=61647) at wireless-security-manager.c:110
nma_other_network_dialog_run (applet=<value optimized out>, create_network=0) at other-network-dialog.c:337
IA__g_closure_invoke (closure=0xb49f60, return_value=0x0, n_param_values=1, param_values=0x7fff20af2f50, invocation_hint=0x7fff20af2e00)

Other information:
The bug is tracked and fixed in the Ubuntu bug-tracker:

https://bugs.launchpad.net/ubuntu/+bug/124336

The problem is a missing prototype in src/wso-private.h:

GtkTreeModel * wso_wpa_create_phase2_type_model (int capabilities, gboolean wpa_eap, int *num_added);