ASDF probably doesn't go deep enough into the implementation for some of these variants to make a difference, but might as well include them anyway. Here's a patch for that. 

Allegro now has (potentially) 16 variants for each OS platform:

 ANSI/modern

 8-bit-character/16-bit-character

 32-bit/64-bit

 SMP/non-SMP

(expt 2 4) --> 16.