Thanks for the link, your support is amazing and very helpful 
!!!
Docker seems to be the solution for solving compiling and should be mentioned in the INSTALL_LINUX.md!
However, now stuck on
Unknown plug-in repository URL GitHub - splidje/Natron: Open-source compositing software. Node-graph based. Similar in functionalities to Adobe After Effects and Nuke by The Foundry.
error.
Other people having the same issue: Compiling Natron yourself using the docker SDK - #14 by Ivanohe73
and again stuck ;(
Solution: Compiling Natron yourself using the docker SDK - #20 by magdesign