Subject:   -34- What are the correct versions of the Irix Development
                Option (IDO) and Fortran for current versions of IRIX?
Date: 12 Jun 1994 00:00:01 EST

  If you're using IRIX 4.0.x, you should be using IDO 4.1.1.  It
  includes C 3.10.1 and the 3.12 back-end (the part of the compiler
  which actually produces the executable; 3.12 is the number you see
  when you use the 'file' command on an executable). The previous
  version was badly buggy; upgrade ASAP.

  IRIX 5.2 needs IDO 5.2, which includes C 3.18. Executables produced by
  the IRIX 5.x back-end don't show a version number with 'file'.

  Each version of IDO has a corresponding version of Fortran, and they
  MUST be used together. IDO 4.1.1 needs Fortran 3.5.1 and IDO 5.2 needs
  Fortran 4.0.1. This is true for other languages as well, but only
  Fortran has confused enough people to have its version numbers here.