onioncat versions

[Alexander Nasonov <alnsn%yandex.ru@localhost>]

Hi,

I'd like to import net/onioncat but it has non-standard version
numbers:

# https://www.cypherpunk.at/ocat/download/Source/current/

   ...
   onioncat-0.2.2.r554.tar.gz  gz 195.7 KB 13-01-13
   onioncat-0.2.2.r556.tar.gz  gz 196.2 KB 20-05-13
   onioncat-0.2.2.r559.tar.gz  gz 196.5 KB 04-07-13
   onioncat-0.2.2.r566.tar.gz  gz 200.1 KB 17-08-14
   onioncat-0.2.2.r569.tar.gz  gz 208.6 KB 09-05-15
   onioncat-0.2.2.r571.tar.gz  gz 209.6 KB 05-03-17
   onioncat-0.2.2.r578.tar.gz  gz 209.9 KB 02-05-17

As you can see, they are all 0.2.2 but with different svn revision numbers.

How to best transform a version without loosing information?
I'm thinking about merging the last two components (teeny and
svn revision):

onioncat-0.2.2.r578 -> onioncat-0.2.2r578

Is there anything better?

-- 
Alex