1) When gcc -E is run in the Mac OS it introduces a line of 
   output that results in showing up as a difference between 
   the .pp and .out files. Removed this OS specific preprocessor 
   text inserted by the preprocessor in the MAC OS. Added a sed 
   regular expression to remove MAC OS specific pre-processor
   text.

2) Added the -w option to diff to remove the differences in
   output being caused in solaris.