Date: Tue Dec  7 10:04:06 CST 1999

  gdiff(1) has been a part of IRIX for many years. It requires GL. It is
  SGI-proprietary and was written using a now-obsolete UI toolkit, so
  its source isn't available and you wouldn't want it anyway.

  'xdiff' first appeared on the second IndiZone CD. It is not to be
  confused with the much less useful program of the same name posted to
  comp.sources.x some years ago. The IndyZoneII version of xdiff is
  now part of IRIX. A newer version of 'xdiff', capable of more
  than two files, is available from http://reality.sgi.com/rudy/xdiff.

  'mgdiff' is a gdiff lookalike based on X11 and Motif, written by Dan
  Williams <dan@sass.com>. It is in the X11R6 contrib stuff, at
  ftp://ftp.x.org/contrib/applications/mgdiff.tar.gz among other places.

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