One of the features we wanted in Instantbird 0.2 was the ability to install libpurple protocol plugins like any other addon. I’m happy to report that this is now possible with current nightly builds.
This file contains a binary module compiled for Windows, Linux and Mac OS X (universal), produced by copying the code from here into the Instantbird source tree. This is the quickest way I found to build it, we will need to figure out a better (without having to download and build the whole Instantbird source code) way later. This is the exact patch I used to build it.