is a patch against the source code of OCaml version 3.10.2 (which you can get from http://caml.inria.fr/download.en.html), to enable the OCaml compiler to produce 64 bit native binaries for Mac OS X Leopard with Intel processors. The patch does not appear to work in Tiger machines, as the make opt.opt step fails. Use at your own risk!!! To do so:

copy the diff file at the top of the ocaml source code directory.
patch -p1 -i ocaml_mac_64_Leop_v0.1.diff
./configure -host x86_64-apple-darwin
Follow the OCaml compiler compilation instructions after the configure step

If you have comments or corrections that I can incorporate in the patch, you can contact me in avaron _at_ amnh _dot_ org.