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Changes between Version 2 and Version 3 of Ticket #45621, comment 1

v2	v3
3	3	If you can't update the remote host to use the same version of OCaml as macports now uses (and build Unison against that) you can re-activate/manually install the older OCaml and force re-build Unison from source.
4	4
5		Because OCaml is only a build dependency for Unison and OCaml 4.02 came after Unison @2.40.102_1, most users did not encounter this until re-installing everything for Yosemite. Unfortunately there was a run-time segfault incompatibility with Unison @~~4.02.0_1 and OCaml 4.02 so I had to revbump the port when fixing it. If you had a working unison @4.02.0~~_1 it's safe to re-activate it (or if you're pre-Yosemite grab it from the pre-built packages since it was built with the older OCaml).
	5	Because OCaml is only a build dependency for Unison and OCaml 4.02 came after Unison @2.40.102_1, most users did not encounter this until re-installing everything for Yosemite. Unfortunately there was a run-time segfault incompatibility with Unison @2.40.102_1 and OCaml 4.02 so I had to revbump the port when fixing it. If you had a working unison @2.40.102_1 it's safe to re-activate it (or if you're pre-Yosemite grab it from the pre-built packages since it was built with the older OCaml).