Bah!..apols for previous post...silly c&p caught some rubbish, here's the right gdb output; Starting program: /usr/bin/perl-64 -I blib/lib -I blib/arch -MGlib::GenPod -MGlib -e "add_types (qq(doctypes)); Glib::GenPod::set_copyright(qq{Copyright (C) 2003-2008 by the gtk2-perl team.\n\nThis software is licensed under the LGPL. See L<Glib> for a full notice.\n}); Glib::GenPod::set_main_mod(qq(Glib)); xsdoc2pod(q(build/doc.pl), q(blib/lib), q(build/podindex));" [Thread debugging using libthread_db enabled] [New Thread 0x7fc2e5dc76f0 (LWP 27788)] Loaded 8 extra types from doctypes Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7fc2e5dc76f0 (LWP 27788)] 0x00007fc2df936da3 in XS_Glib__Type_list_values () from blib/arch/auto/Glib/Glib.so Current language: auto; currently asm (gdb) bt #0 0x00007fc2df936da3 in XS_Glib__Type_list_values () from blib/arch/auto/Glib/Glib.so #1 0x000000000046a6bc in Perl_pp_entersub () #2 0x0000000000468c4e in Perl_runops_standard () #3 0x0000000000464679 in perl_run () #4 0x000000000041ecbc in main ()