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─────NMAKE──────────────────────────────────────────────────────────────────
 
     NMAKE preprocessing directives are similar to compiler
     preprocessing directives. NMAKE reads and executes preprocessing
     directives before processing the makefile as a whole.
 
     Preprocessing directives let you:
 
        ■ Turn options on or off    ◄!CMDSWITCHES Directive►
 
        ■ Display messages          ◄!ERROR, !MESSAGE Directives►
 
        ■ Include other files       ◄!INCLUDE Directive►
 
        ■ Undefine a macro          ◄!UNDEF Directive►
 
        ■ Execute conditionally     ◄!IF..., !ENDIF Directives►
                                    ◄!ELSE... Directives►
 
     During conditional preprocessing, you can run a command or program
     and use the return value in an expression.
     See: ◄Expressions in Preprocessing►
          ◄Running a Program in Preprocessing►
 
     Syntax Rules
 
     Preprocessing directives begin with an exclamation point (!),
     which must appear at the beginning of the line. Zero or more
     spaces or tabs can appear between the exclamation point and the
     directive name. You can use this space as indentation to make your
     file more readable. Preprocessing directives (and their keywords
     and operators) are not case sensitive.
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