with import <nixpkgs> {}; {
    TankDriverEnv = stdenv.mkDerivation {
        name = "TankDriver";
        buildInputs = [ mesa mono dotnetPackages.Nuget xorg.libX11 ];
        LD_LIBRARY_PATH="${xorg.libX11}/lib:${mesa}/lib";
    };
}

with import <nixpkgs> {}; {
    TankDriverEnv = stdenv.mkDerivation {
        name = "TankDriver";
        buildInputs = [ mesa mono46 dotnetPackages.Nuget xorg.libX11 ];
        LD_LIBRARY_PATH="${xorg.libX11}/lib:${mesa}/lib";
    };
}

Use mono 4.6 available since 16.09
Use mono 4.6 available since 16.09
