Mainly tested on:
  Box
    - Pentium 133MHz PC. [PC-9821 Cu13E/A]
  OS
    - Linux 2.4.1-pc98 [Kondara MNU/Linux 2.0 (Mary)]
  Make
    - GNU Make version 3.79
  C compiler
    - gcc version 2.96 20000731 (Kondara MNU/Linux 2.0)
  Ruby
    - ruby 1.6.4 (2001-06-04) [i586-linux]
  Gtk+
    - GTK+-1.2.10
  GIMP
    - GIMP 1.2.1
  Ruby/GTK
    - ruby-gtk-0.26
  BGM ;-)
    - `Concerto for Violin and Orchestra in E major' (BWV1042)
