trying to install and run http://www.fudgie.org/

$ ~/bin/gl_tail
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require': no such file to load -- gl (LoadError)
        from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
        from /home/dan/bin/gl_tail:67


$ pkg_info | grep -i ruby
ruby-1.8.6_2,1      An object-oriented interpreted scripting language
ruby18-bdb-0.6.1    Ruby interface to Sleepycat's Berkeley DB revision 2 or lat
ruby18-bdb1-0.2.3   Ruby interface to Berkeley DB revision 1.8x with full featu
ruby18-gems-0.9.4   Package management framework for the Ruby language
ruby18-opengl-0.32b_3 OpenGL/GLU/GLUT interface modules for Ruby
ruby18-termios-0.9.5,1 A Ruby interface to termios
rubygem-needle-1.3.0 Dependency-injection/inversion-of-control container
rubygem-net-ssh-1.1.2 Non-interactive SSH processing


From the source code:

# Versions tested:
#   rubygems    0.9.4
#   ruby-opengl 0.40.1
#   net-ssh     1.1.2

Mind you, I'm not on ruby-opengl 0.40.1

Other ideas?