In the advent of several commercial builds for the next months I updated the base system to recent LFS builds. This means Glibc 2.21. Kernel 4.1, GCC 5.1, some tools and libraries from Gnome 3.16 and Firefox and Thunderbird in version 38.0.x. These build are already relatively stable, however there are some issues with Clutter or Cogl which meany three of the games from Gnome 3.16 do not work currently.
When building on recent sources Ruby-Nokogiri has to be installed since this component is now used to check for updates. Grab the (unstable) ISOs here, both “Search and Rescue” and “BigFatFull Jabba” for building: