Glade 3.8 catalog location(s)?

I’m hacking on an existing Glade/Python app that I don’t have a proper build environment for; I’ve just got the distribution. I’ve got the right version of Glade installed now (3.8) to open the GTK+2 files the app is built with, but the app uses gtksourceviewand Glade can’t find it. It’s installed on the system (quite a few files on disk reference it), but I’m not sure where to put what so Glade can find it.

$ find / -name "*gtksourceview*" 2> /dev/null
/var/lib/dpkg/info/libgtksourceview-3.0-1:amd64.md5sums
/var/lib/dpkg/info/libgtksourceview-3.0-1:amd64.postinst
/var/lib/dpkg/info/libgtksourceview2.0-0.postinst
/var/lib/dpkg/info/python-gtksourceview2.md5sums
/var/lib/dpkg/info/libgtksourceview2.0-0.postrm
/var/lib/dpkg/info/libgtksourceview-3.0-1:amd64.symbols
/var/lib/dpkg/info/libgtksourceview2.0-0.shlibs
/var/lib/dpkg/info/libgtksourceview-3.0-1:amd64.postrm
/var/lib/dpkg/info/libgtksourceview-3.0-1:amd64.shlibs
/var/lib/dpkg/info/libgtksourceview-3.0-1:amd64.list
/var/lib/dpkg/info/libgtksourceview-3.0-common.list
/var/lib/dpkg/info/libgtksourceview2.0-common.list
/var/lib/dpkg/info/libgtksourceview2.0-common.md5sums
/var/lib/dpkg/info/libgtksourceview-3.0-common.md5sums
/var/lib/dpkg/info/libgtksourceview2.0-0.list
/var/lib/dpkg/info/python-gtksourceview2.list
/var/lib/dpkg/info/libgtksourceview2.0-0.md5sums
/home/operator/.local/share/gtksourceview-2.0
/usr/share/pygtk/2.0/defs/gtksourceview2.defs
/usr/share/gtksourceview-2.0
/usr/share/locale/<lots of localizations>
/usr/share/locale-langpack/en_GB/LC_MESSAGES/gtksourceview-3.0.mo
/usr/share/locale-langpack/en_AU/LC_MESSAGES/gtksourceview-3.0.mo
/usr/share/locale-langpack/en_CA/LC_MESSAGES/gtksourceview-3.0.mo
/usr/share/doc/libgtksourceview2.0-0
/usr/share/doc/libgtksourceview2.0-common
/usr/share/doc/libgtksourceview-3.0-common
/usr/share/doc/python-gtksourceview2
/usr/share/doc/libgtksourceview-3.0-1
/usr/share/gtksourceview-3.0
/usr/share/gtk-doc/html/pygtksourceview2
/usr/share/gtk-doc/html/pygtksourceview2/pygtksourceview2.devhelp
/usr/share/gtk-doc/html/pygtksourceview2/class-gtksourceview2.html
/usr/share/pyshared/gtksourceview2.la
/usr/lib/pkgconfig/pygtksourceview-2.0.pc
/usr/lib/libgtksourceview-2.0.so.0
/usr/lib/python2.7/dist-packages/gtksourceview2.so
/usr/lib/libgtksourceview-2.0.so.0.0.0
/usr/lib/pyshared/python2.7/gtksourceview2.so
/usr/lib/x86_64-linux-gnu/libgtksourceview-3.0.so.1.1.0
/usr/lib/x86_64-linux-gnu/libgtksourceview-3.0.so.1

Is there a way to tell Glade where to look? If not, can anyone tell me what files from above I should copy to where so Glade can find them? Thanks!