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Changes between Initial Version and Version 1 of Ticket #45621, comment 1

initial	v1
1	1	This is an incompatibility between Unison built with OCaml 4.02 and Unison built with OCaml < 4.02 due to changes in object serialization made in OCaml 4.02. If client and server are both built with OCaml 4.02 there is no exception, similarly if client/server are both built with OCaml < 4.02 there is no exception. There isn't really anything Macports can do here, we only want to support one (the most recent stable) OCaml release.
2	2
3		If you can't update the remote host to use the same version of OCaml as macports ~~and~~ now uses (and build Unison against that) you can re-activate/manually install the older OCaml and force re-build Unison from source.
	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	5	Because OCaml is only a build dependency for Unison and OCaml 4.02 came after Unison @4.02.0_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).