<p>
Mesa 9.1.2 and later (will) support a DRI configuration option to work around
this issue.
-Using the <a href="http://dri.freedesktop.org/wiki/DriConf">driconf</a> tool,
+Using the <a href="https://dri.freedesktop.org/wiki/DriConf">driconf</a> tool,
set the "Create all visuals with a depth buffer" option before running Topogun.
Then, all GLX visuals will be created with a depth buffer.
</p>