At the moment I'm running the (patched) Debian-version of libpar2, in use with the latest nzbget-svn (14.0~).
Their are a couple of reasons why I switched over to the Debian-branche:
- Patches are included (timeout, block scanning, etc.)
- Recommended by the NZBGet-devs
- Their seems to be a some activity, at the 'main' branche of libpar2 seems to be dead.
- The only patch I needed to add was libpar2-0.4-external-verification.patch to get it to work with nzbget(-svn).

At the moment I'm testing 'my' version, that I have uploaded into the AUR:
https://aur.archlinux.org/packages/libpar2-git/ (note: this is the Git-version, but there are tarballs released)

Everything seems to work fine and when compiling nzbget, I don't get any 'No''s on the libpar2 checks.

The reason why I'm asking, is when NZBGet released it's final version of the v14 branche, their is already a working libpar2 for it (at least I hope so).

Let me know if any debug info is needed. :)

Thanks!