openbsd-ports/net/unison/pkg
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$OpenBSD: README,v 1.1 2014/10/17 06:22:08 chrisz Exp $

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| Running ${FULLPKGNAME} on OpenBSD
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Unison uses native OCaml marshalling in its prococol. This
means that unison might not work when the OCaml versions of
two instances are out of sync.
One way to work around this limitation of unison is to use
the OPAM OCaml package and compiler manager to sync the
OCaml versions on your machines.