Hi there!
You can not "add" your self-compiled libs to the binaries. Since version 6.6 the xcfun libraries with these functional are included. Just modifiy the $dft data group thus:
$dft
functional m06-2x
gridsize m4
or thus:
functional m06
gridsize m4
Since version 7.0 you can select these functional also in the define menu.
Or you can use the GUI TmoleX (4.0 and newer) to set up calculations with these functionals.
Cheers,
Arnim