The following variables are defined to make targets and rules easier:
     
- 
COMPILER 
 - Is the complete compiler command line, with all options added, after all
     Makefile variables have been examined.
     
 - 
DATESTR 
 - Contains the date.
     
 - 
UNITPPUFILES 
 - A list of unit files that will be made. This is just the list of unit objects,
     with the correct unit extension appended.