https://nixos.org/manual/nixpkgs/stable/#users-guide-to-lua-infrastructure

https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/lua-packages.nix

lua-5
https://github.com/NixOS/nixpkgs/tree/master/pkgs/development/interpreters/lua-5
https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/interpreters/lua-5/default.nix
    ! lua5_2, lua5_2_compat, luajit...
https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/interpreters/lua-5/setup-hook.nix    
https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/interpreters/lua-5/interpreter.nix
https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/interpreters/lua-5/wrap-lua.nix
https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/interpreters/lua-5/build-lua-package.nix

luajit
https://github.com/NixOS/nixpkgs/tree/master/pkgs/development/interpreters/luajit