root@ProtoType2:/opt/gltail/bin# bundle install
Don't run Bundler as root. Bundler can ask for sudo if it is needed, and installing your bundle as root will break this
application for all non-root users on this machine.
Fetching gem metadata from https://rubygems.org/.....
Resolving dependencies...
Using chipmunk 5.3.4.5
Using tins 0.7.0
Using file-tail 1.0.12
Using net-ssh 2.6.5
Using net-ssh-gateway 1.2.0

Gem::InstallError: opengl requires Ruby version >= 1.9.2.
An error occurred while installing opengl (0.8.0), and Bundler cannot continue.
Make sure that `gem install opengl -v '0.8.0'` succeeds before bundling.
root@ProtoType2:/opt/gltail/bin# gem list opengl

*** LOCAL GEMS ***

opengl (0.9.0, 0.8.0)
root@ProtoType2:/opt/gltail/bin# ./gl_tail gl_tail.yaml
Rubygems and/or bundler missing.
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:60:in `require': cannot load such file -- glut (LoadError)
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:60:in `rescue in require'
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:35:in `require'
        from /opt/gltail/lib/gl_tail.rb:16:in `<top (required)>'
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from ./gl_tail:77:in `<main>'