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[Fred <973559@xxxxxxxxxxxxxxxxxx>]

$ env DISPLAY=:0 gdb /usr/bin/gtk-window-decorator
GNU gdb (Linaro GDB) 7.4-2012.06-ubuntu
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>...
Reading symbols from /usr/bin/gtk-window-decorator...(no debugging symbols found)...done.
(gdb) break _exit
Function "_exit" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y

Breakpoint 1 (_exit) pending.
(gdb) run --sync --replace
Starting program: /usr/bin/gtk-window-decorator --sync --replace
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
No protocol specified

(gtk-window-decorator:6106): Gtk-WARNING **: cannot open display: :0

Breakpoint 1, 0x00007ffff503c2b0 in _exit ()
   from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0  0x00007ffff503c2b0 in _exit () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007ffff4fb9940 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007ffff4fb9965 in exit () from /lib/x86_64-linux-gnu/libc.so.6
#3  0x00007ffff6f47e43 in gtk_init ()
   from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#4  0x000000000040a77a in main ()

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https://bugs.launchpad.net/bugs/973559

Title:
  Window decoration not showing up

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