Requirements:

1. Vagrant and Vagrant-SSHFS

How to install:

Ubuntu:
sudo apt install vagrant vagrant-sshfs

Fedora:
sudo dnf install vagrant vagrant-sshfs

Arch Linux:
sudo pacman -S vagrant

2. VirtualBox

Note: needed due to issues with libvirt. For installation instructions, refer to your distribution's documentation.

Building Instructions:

Set up Vagrant instance:

git clone --recurse-submodules https://github.com/lutris/vagrant-builder  
cd vagrant-builder 
VAGRANT_DEFAULT_PROVIDER=virtualbox vagrant up  

You may need to run VAGRANT_DEFAULT_PROVIDER=virtualbox vagrant up twice since it may ask to install vagrant-sshfs the first time.

To build wine, run:

./makebuild.sh <name> <version> <winerepo> <branch>

where <name> <version> <winerepo> <branch> are parameters.

Example: ./makebuild.sh lutris 6.10-7 https://github.com/lutris/wine lutris-6.10-7

Final build will be placed in vagrant-builder/vagrant_share/ in a wine-name-branch-x86_64.tar.xz name format. For example: wine-lutris-6.10-7-x86_64.tar.xz

Build Installation:

1. Extract contents wine-name-branch-x86_64.tar.xz to /home/USERNAME/.local/share/lutris/runners/wine/.
   Note: Some archive manager may place the contents of an archive inside an additonal parent folder. For example, Nautilus will place contents of wine-lutris-6.10-7-x86_64.tar.xz, which is the folder called lutris-6.10-7-x86_64, inside the parent wine-lutris-6.10-7-x86_64 folder. You need to copy the folder inside it, lutris-6.10-7-x86_64, not the parent directory.
2. Restart lutris. You can now choose wine-name-branch-x86_64 from the runners list in configuration options for any game.