Upgraded the underlying SWI-Prolog to the most recent stable release, 5.2.10. Checked speeds and generation seems the same, but parsing a tiny bit slower, not enough to worry, change has been made permanent.
November 2003 Archives
Status update on infinitive work: Prolog code is complete, pending some slight discrepancies for strong and first weak verbs. As the variations are far fewer, t, and tn derived stems will be included.