Binary distribution of the GNAT compilation system includes
     * compiler, binder, gnatmake, cross reference, etc
     * a textual (command line) version of the GNAT debugger (gdb)
     * a new graphical frontend for gdb (gvd)

  To install the GNAT compiler uncompress the binary distribution using the
  gunzip utility (or equivalently 'gzip -d').

  The gzip program is available in source form from any GNU mirror site in
  shar, tar, or gzipped tar format if you do not already have it on your
  system.

  Below "xxx" stands for a particular machine configuration such as
  sparc-sun-solaris2.5.1.

  gunzip -c gnat-3.15p-xxx-bin.tar.gz | tar xf -
  cd gnat-3.15p-xxx-bin

  Look at the file README contained in the distribution for
  further instructions.

  Note the addition of the new graphical frontend to the debugger called gvd