My understanding is that Void has xbps-src [1], [2] for installing packages from source code, and it is somewhat similar to AUR. Xbps-src package database is essencially a github repository, you clone it and use it to build and install packages for your system. I installed it and used only once to build some obscure video streaming program, which failed to compile, and I did not follow up to figure out why it failed.
[1] https://github.com/voidlinux/void-packages/blob/master/READM...