Comment 12 for bug 1074028

You're right, libglade is also obsolete and you'll need to convert to GtkBuilder. Fortunately there's a script that can do that conversion for you easily. See here: http://www.micahcarrick.com/gtk-builder-libglade-faq.html So that should be a relatively small part of the overall effort.

Tough to estimate how much work it would be. Your project is quite a bit larger than most of the others also tagged on this bug... I expect you could do it within a couple weeks of full-time effort. Fortunately there are conversion scripts that can help with the port to introspection, but it's not quite as complete as the one for gtkbuilder, so there is still some manual effort involved in that.

As for gphoto2, I just don't have any experience with that, sorry. Sounds buggy, I'd avoid it if possible ;-)