This is a stripped down and modified version of unac-1.7.0
You can find the full original distribution at http://www.senga.org/unac/
You can find the full version used by Recoll at the following url:

http://bitbucket.org/medoc/recoll/src/tip/unac/

See AUTHORS and COPYING for tributes, etc.

Dont bother Loic Dachary about bugs in this version, you can find the culprit
here: jfd@recoll.org