I have pre-compiled v3.7 shipped with Ubuntu official repository. I would like
to install v3.8 in a local directory to test it along with v3.7.
I was unable to find instruction for compiling v3.8 in Linux.
The current releases at https://github.com/POV-Ray/povray/releases are
apparently for Windows (there is no make file) and upgrade an available
installation.
