There are some more options that can be set with special variables. In general they are
simply shortcuts and can be replaced with adding compiler command-line options to
OPT:
     
- 
LINKSMART=1 
 - adds -XX to the compiler command-line options.
     
 - 
CREATESMART=1 
 - adds -CX to the compiler command-line options.
     
 - 
DEBUG=1 
 - adds -gl and -dDEBUG to the compiler command-line options.
     
 - 
RELEASE=1 
 - adds -O1r or -O2 depending on the CPU, and -Ur and -DRELAASE to the
     command-line.
     
 - 
STRIP=1 
 - adds -Xs to the command-line.
     
 - 
OPTIMIZE=1 
 - adds -O2 to the command-line.
     
 - 
VERBOSE=1 
 - adds -vwni to the command-line.