4.3BSD - /usr/src/new/emacs/shortnames/header.h

   1: /* Header file to remap longnames to shortnames.  Note that not
   2:    all cpp's support longnames.  In particular, most pre 5.2 UniSoft
   3:    ports only support 16 unique characters.  To bootstrap GNU emacs
   4:    to a 5.0 UniPlus+ system I had to port the 5.2 cpp (with FLEXNAMES)
   5:    to the development system.  This was about a 1 hour job with sources.
   6:    Alternatively, m4 can probably be used but this is not as clean and
   7:    requires some changes to the default make rules (add rule to go from
   8:    a ".cm4" file to a ".c" file and rule to go from a ".hm4" file to
   9:    a ".h" file.  There are too many changes for sed to handle in a single
  10:    pass.    Fred Fish, UniSoft Systems. */