Thanks for the clues, everyone! I'll fix it for Windows. Note that I'm getting email in wild bursts, and most often delayed. So I'm generally not seeing any checkin msgs, or SF bug email, or Python-Dev email, ..., anywhere near the time (or, alas, sometimes even day) they're generated. So I simply didn't see the checkin msg introducing cellobject.c. all's-well-that-looks-like-it-may-end-ly y'rs - tim