This is kinda hacked together, but it's a hello triangle for Google Filament with GLFW.
Target platform is Ubuntu 16.04. This was tested against filament a831c507cfd0e3fdce3e78df51fe5b7995f0b89c, with the build files modified slightly so it could compile.
CC=/usr/bin/clang-6.0 CXX=/usr/bin/clang++-6.0 cmake -H. -Bbuild && cmake --build build