Why does ubuntu have a separate package for unison version 2.27.57?

Posted by intuited on Ask Ubuntu See other posts from Ask Ubuntu or by intuited
Published on 2011-02-08T23:15:55Z Indexed on 2011/02/08 23:34 UTC
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unison

The current ubuntu repo contains an extra set of packages for version 2.27.57 of the unison file sychronization utility:

$ aptitude search unison
p   unison                          - A file-synchronization tool for Unix and W
p   unison-gtk                      - A file-synchronization tool for Unix and W
p   unison2.27.57                   - A file-synchronization tool for Unix and W
p   unison2.27.57-gtk               - A file-synchronization tool for Unix and W

$ aptitude show '~nunison[^-]*$' | grep 'Package\|Version'
Package: unison
Version: 2.32.52-1ubuntu2
Package: unison2.27.57
Version: 2.27.57-2

What is the reason for this? Are there backwards incompatibilities in more recent versions of unison?

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