I just finished compiled OCaml from source on Opensolaris (2009.06), the latest version at this time of writing is 3.11.1.
The steps are straight-forward except one catch: The build is dependent on gcc and gnu make. In fact the default 'make' program that comes with Solaris won't work.
Solution is simple: go to www.blastwave.org and download the relevant packages. Just follow their instructions and you should be fine. :)
On an unrelated note, I miss her again but don't have anyway to contact her anymore... :(