Upgrade build system for Ubuntu/Debian
Both Ubuntu and Debian have new stable releases, not sure if it's relevant
When I went to download the new pre-release, I noticed that the Ubuntu version is for 12.04 LTS, and the Debian version is for Debian 6.
Ubuntu recently released a new LTS, 14.04, and Debian 7 has been stable for quite a long time.
It's probably not an issue at the moment, the executables should work , but it might be in the future. It might be worth looking in to building for Ubuntu 14.04 and Debian 7 instead.