http://www.ozemail.com.au/~mpp/elex/elex.html. A version of
Elex including Prolog support is available from
http://www.let.rug.nl/~vannoord/Elex/index.html under the same
conditions. Elex is implemented in Perl5 and C++ and will
work on most UNIX platforms. The resulting Prolog code is compatible
with at least SICStus Prolog, SWI-Prolog, BProlog, BinProlog and
presumably Quintus Prolog.