Compile on Docker

Overview
Among the options for building and installing FreeCAD, there is the option of using Docker. This method is primarily useful for FreeCAD developers, using Linux or Mac OS computers.

Benefits
All of FreeCAD's dependencies are already installed, compatible with each other, and configured appropriately, allowing you to get started developing very quickly.
 * The dependencies are contained within the docker container, preventing any unwanted packages contaminating your workstation, and preventing any clashing versions.
 * The source code and build directories are outside the docker container. This allows you to use your preferred editors, versioning systems, dev tools etc, without having to set them up in the docker container. You can just use them as normal, right from your workstation. (Also, it means you don't have to rebuild the docker container each time you want to build FreeCAD.)
 * For those using obscure *nix distros and instructions are not available for fetching dependencies, all you need to install on your workstation is docker, which is quite commonly available across many distributions.
 * It provides a static, immutable development environment. I personally find this useful when developing to reduce the number of potential variables that could be causing an issue. You know you've not altered something esoteric in the environment between builds. For developers collaborating, and both using the same docker container, you can be sure you're both working from the same environment, which reduces communication errors caused by differences in environment.

Docker Repository

 * Original: https://gitlab.com/daviddaish/freecad_docker_env
 * Official: https://GitHub.com/FreeCAD/Docker

Prerequisites

 * 10GB of free storage
 * Docker

Download the source
The best way to get FreeCAD's source code is to clone the Git repository. For this you need the program which can be easily installed in most Linux distributions, and it can also be obtained from the official website.

This will place a copy of the latest version of the FreeCAD source code in a new directory called.

For more information on using Git, and contributing code to the project, see Source code management.

Source archive
Alternatively you can download the source as an archive, a or  file, and unpack it in the desired directory.

Create build directory
Create a directory to hold your compiled FreeCAD source.

Pull Docker image
Pull the Docker image. (Official image coming soon.)

Allow access to your window manager
In order for FreeCAD to launch it's GUI from within the Docker container, you need to give Docker access permissions to your window manager. In most Linux distributions, this is the X window system. You can use the below command to allow blanket access to X, until you reboot your computer.

Launch the docker image
Assign environment variables so the Docker container will mount FreeCAD's source code, and build directory. In addition, you can mount an extra directory to contain any files you'd like to use for testing purposes. In the below snippet, we've left it as your home directory as a simple default.

Discussion
FreeCAD forum thread: https://forum.freecadweb.org/viewtopic.php?f=4&t=42954

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