To complete compilation of Signature on Mac computers with more recent versions of the OS or hardware (OS 10.5 on the older PowerPC CPUs, OS X on the new generation Intel-based CPUs) follow the installation instruction of the original distribution (Signature_Install.tar.gz) to compile the libraries, and then compile Signature using the new Makefile (Makefile.PowerPC or Makefile.Intel, depending on your OS and hardware):

1. Change directory to the installation directory.
   "cd Signature_Install"
2. Place the two Makefiles (Makefile.PowerPC, Makefile.Intel) into the installation directory.
2. Finalize compilation of Signature.
   "make -f Makefile.PowerPC"  (for PowerPC CPUs), or
   "make -f Makefile.Intel"    (for newer Intel-based CPUs)
