gtk3-perl is the collective name for a set of Perl bindings for Gtk3 and various related libraries. These modules make it easy to write Gtk3 applications using a natural, Perlish syntax.
The files in this package are demos made mostly from re-writing the demos from the gtk2-perl package, as well as some from other sources. These files serve to not only give other gtk3-perl writers some examples from which to work, but also to help ensure the main Gtk3.pm module works as intended.
Recommend using pre-packaged versions first. If not, there's the tried and true (but more difficult):
perl Makefile.PL make make test make install
Questions, comments, suggestions, bug fixes for gtk3-perl
gtk3-perl mailing list
Questions, comments, suggestions, bug fixes for the demos here
gtk3-perl git source
Perl help (highly recommended website)