Wanted: quadword arithmetic package in C

[Gertjan van Oosten]

I am looking for a package, written in C, that does quadword integer
arithmetic, i.e. I want to be able to compute using 8 byte integers.

Sincerely,
--
-- Gertjan van Oosten, gertjan at west.nl  OR  gertjan at westc.uucp
-- West Consulting bv, Phoenixstraat 49, 2611 AL  Delft, The Netherlands
--                     P.O. Box 3318,    2601 DH  Delft
-- Tel: +31-15-123190, Fax: +31-15-147889