Even though it was Sunday, I made the following changes:
Updated the third glade file that was not changed earlier, i.e drgenius2.glade
Replaced old glade syntaxes with the newer ones just like yesterday.
Files: drgenius_config.cc, drgenius_mdi.cc, drgeo_adaptDialog.cc
Removed the glade_init() call from the main, since the GtkBuilder format doesn't need one.
The glade format would be fully functional when used with Gtk-3.0 and not with 2.0. So I now I need to port drgeo from gtk-2.0 to gtk-3.0 first.
For that purpose, I compiled and installed Gtk-3.0.12 along with its additional dependencies. But if there is any ppa that could make this step easier, it’d be extremely helpful.