There are two versions of the program:
  'with' => with polymorphism.
  'without' => without polymorphism.

Build the programs.

  cd with/src/; make
  cd ../../without/src/; make; cd ../..

The executable can then be run by typing

  ./with/src/PolyMorph.exe
  ./without/src/PolyMorph.exe
