Dear Ocaml-ers,
If you would like to use C's unsigned long long type in ocaml, please 
try my library. I've tested it only on Mac OS X ppc32, ocaml 3.10.x. 
Please let me know about any modifications I should make; for instance, 
I don't know how to make the library work in windows. Also I haven't 
tested storing UInt64.t in hashtables much yet.

http://www.msu.edu/~shawjef3/uint64lib.zip

Quick instructions:
unzip uint64lib.zip
cd uint64lib
ocaml compile.ml
ocaml uInt64.cma
#install_printer UInt64.printer16;;
UInt64.of_string "0x123456789abcdef";;

Sincerely,
Jeff Shaw