Mainly tested on:
  Box
    - Pentium 133MHz PC.
  OS
    - Linux 2.4.1-pc98 [Kondara MNU/Linux 2000 (Sushi)]
  Make
    - GNU Make version 3.79
  C compiler
    - gcc version 2.95.3 19991030 (prerelease)
  Ruby
    - ruby 1.6.2 (2000-12-25) [i586-linux]
  Gtk+
    - GTK+-1.2.8
  GIMP
    - GIMP 1.2.0
  Ruby/GTK
    - ruby-gtk-0.24
  BGM ;-)
    - `Concerto for Violin and Orchestra in E major' (BWV1042)
