Is there work underway to update pgAdmin to use the 3.0 branch of wxWidgets?
AFAICT, this work is already done. I didn't check lately though.
The INSTALL file and build-wxgtk make mention of the need for the wxWidgets 'contrib' directory. My understanding is that this directory was removed (probably why my builds are failing locally) with the release of 3.0 ( http://wxwidgets.blogspot.com/2013/11/some-30-release-stats.html ).