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Using macros in directives
--------------------------
The macro $d is used with the !if conditional directive to perform
some processing if a specific macro is defined. The $d is followed by
a macro name, enclosed in parentheses or braces, as shown in the
following example.

  !if $d(DEBUG)                #If DEBUG is defined,
  bcc -v f1.cpp f2.cpp         #compile with debug information;
  !else                        #otherwise (else)
  bcc -v- f1.cpp f2.cpp        #don't include debug information.
  !endif

Don't use the $d macro when MAKE is invoked with the -N option.