Few of test/sample files have different path of ruby like '#!/usr/bin/ruby',
'#!/usr/local/bin/ruby' and '#!/usr/bin/env ruby'.. I am maintainer for all
ruby-gtk2/ruby-gnome2 in FreeBSD ports tree. I had to add patch in
Makefile to get all files to have '#!/usr/bin/env ruby', so I think this is what
should be default in ruby-gnome2-all package.