G3D-THUMBNAILER

the directory "thumbnailer" contains a program to create small images
("thumbnails") for file managers like Nautilus. The program ("g3d-thumbnailer")
is installed by default, but the integration step has to be done on a user
basis at the moment. To install the mime information (freedesktop.org shared
mime info stuff) and the integration into Nautilus you have to do the
following steps as _normal user_:

$ cd thumbnailer
$ make install-data-user

This procedure will be integrated into the usual installation process for
all users in the future.