Hi,
Today, I have tried installing gnuradio on Antergos (Arch Linux based distro) using pybombs. Antergos ships Python3 as it's default python version and Cheetah seems to be incompatible with Python3. The build fails due to the unmet dependency of Cheetah template engine.
The successful builds on Ubuntu 16.04 reported in this thread are because Ubuntu 16.04 claims to be shipping Python3.5.1 as it's default Python version, but it still has a good support for Python2.7.x.
This issue of replacing Cheetah is slightly discussed at [1].
Cheers,
Ravi