"Settings schema 'org.gnome-mines' is not installed"
 

Hi,
I use Ubuntu-12.10 and need to get development versions of softwares for translations.
I recently got gnome-mines and gthumb from git. After installing appropiate libraries with "sudo apt-get build-dep sofwarename", I ran
./autogen.sh --prefix=/opt
make -j6
sudo make install -j6
without any breakdowns.
But when I start /opt/bin/gnome-mines or /opt/bin/, i get the errors:

$ /opt/bin/gnome-mines
(gnome-mines:4763): GLib-GIO-ERROR **: Settings schema 'org.gnome.mines' is not installed
Trappe pour point d'arrêt et de trace (core dumped)
(=Trap for break point and track?)

/opt/bin/gthumb
(gthumb:4935): GLib-GIO-ERROR **: Settings schema 'org.gnome.gthumb.browser' is not installed
Trappe pour point d'arrêt et de trace (core dumped)

I found some hits about these errors on Internet, but no solution.
What do these errors mean? What can i do to resolve this problem?

I installed gimp and banshee from git without any problem.

Thanks in advance.