Build on Ubuntu 20.04

sudo apt -y install libbullet-dev libassimp-dev liblua5.2-dev libluabind-dev  \
                    libqglviewer-headers libqglviewer-dev-qt5 freeglut3-dev libglew-dev \
                    libsdl2-dev git g++

The build on Ubuntu 20.04 compiles fine, but fails to run with an assertion, see issue #11 for that failing assertion in luabind.

Optional but recommended run-time dependencies:

• OpenSCAD from http://www.openscad.org/downloads.html#snapshots

wget -qO - http://files.openscad.org/OBS-Repository-Key.pub | sudo apt-key add -
sudo nano /etc/apt/sources.list.d/openscad.list

deb http://download.opensuse.org/repositories/home:/t-paul/xUbuntu_20.04/ ./

sudo apt update
sudo apt -y install openscad-nightly