Unfortunately, I have much less free time those days and can no longer monitor OCaml packages on Ubuntu. Is anybody willing to work on this?
The main job is to look at the Debian packages and check if they are currently available in Ubuntu, and rebuild them if necessary. When the OCaml compiler changes (fortunately not so often), one needs to trigger a rebuild of all packages and that can be a bit difficult, mainly because LaunchPad does not provide an interface to rebuild several packages, taking into account their dependencies.
Of course, I would help anybody willing to do that job (explain the needed scripts, issues I had, etc.).