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[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has
+ not been called
[xcb] Aborting, sorry about that.
perl: ../../src/xcb_io.c:274: poll_for_event: Assertion `!xcb_xlib_thr
+eads_sequence_lost' failed. Aborted

#!/usr/bin/perl
use Gtk2 '-init -threads-init';
...
        $mw->show;
    }
}