destex.l and deslatex.l are derived from detex.l and delatex.l from
the standard UNIX distribution (author Howard Trickey at Stanford
University).

Funiq.c is due to Bill Vaughn at University of Rochester.  Funiq makes
spell a bit faster.

spell.patch is relative to /usr/bin/spell on a SUN 3 running SUN UNIX
version 3.2, but most 4.2-derived spells will probably do.