gistfile1.txt

$ gdb --args /usr/share/tilemill/node_modules/topcube/build/default/topcube -u http://google.com
GNU gdb (Ubuntu/Linaro 7.2-1ubuntu11) 7.2
Copyright (C) 2010 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://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/share/tilemill/node_modules/topcube/build/default/topcube...(no debugging symbols found)...done.
(gdb) r
Starting program: /usr/share/tilemill/node_modules/topcube/build/default/topcube -u http://google.com
[Thread debugging using libthread_db enabled]

(process:23467): GLib-WARNING **: /build/buildd/glib2.0-2.28.6/./glib/goption.c:2132: ignoring no-arg, optional-arg or filename flags (800) on option of type 4202884
Error parsing options: Cannot open display: 

Program exited with code 01.
(gdb) bt
No stack.
(gdb) quit

$ /usr/share/tilemill/node_modules/topcube/build/default/topcube -u http://google.com 
(process:23470): GLib-WARNING **: /build/buildd/glib2.0-2.28.6/./glib/goption.c:2132: ignoring no-arg, optional-arg or filename flags (800) on option of type 4202884
Error parsing options: Cannot open display: