Comment 6 for bug 1514240

Btw, just for the record: mp3gain has been removed from Debian (and subsequently Ubuntu too) because of severe security issues. See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=742112 for details.
So, in order to properly reintroduce it, some work needs to be done to make it secure and update it's code.