`allegro-config --libs` doesn't include right file

The Mac OS X port uses allegro-config --libs when linking object files, but this includes the wrong file: -lalleg-4.2.1, which does not work. Inside the makefile, replacing allegro-config --libs with it's contents (except for -lalleg-4.2.1, which should be changed to -lalleg-4.2.2) will remedy this, for end users. However, for devs, the solution is probably obvious, but just in case: replace the 1 with a 2!