Here I paste the unison 2.48.3 compiled for Sailfish OS / Jolla:
https://yadi.sk/d/PtAhXBf0kRwKh

It is just a binary file which can be run putting it in your path or calling it since where it is. I suggest to read
http://www.cis.upenn.edu/~bcpierce/u...on-manual.html set up the profiles in a pc and then copy into ~/.unison

It is a good tool to synchronize files with a computer I used it every week in my maemo (n900): http://talk.maemo.org/showthread.php?t=27426

It does not have any GUI.

[Edit 2015-11-30:
Here I paste the unison 2.48.3 compiled for Sailfish OS / Jolla with ocalm 4.01 instead of ocalm 4.02:
https://yadi.sk/d/e_4rKFrnkqZRp

(There is some bug in connections between unison compiled with ocalm 4.01 and 4.02, just in case)]

Edit 2015-12-7:
Now Unison can be downloaded from this repository done by Temev:
zypper ar -f http://repo.merproject.org/obs/home:...ev:unison.repo

I have added a very "home made" GUI for unison at this repository:
https://openrepos.net/content/antoniovr/sailuni
It is still too simple (I don't know if it has any advantage from the text script...), I will add some brief profile edition capability, and publish source code in case someone wants to go on. I think this GUI can be done in minutes by someone with experience hehehe.