NMAKE Help (nmake.hlp) (Table of Contents; Topic list)
/V Option
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     Syntax:  /V
 
     Causes all macros to be inherited when recursing. By default, only
     macros defined on the command line and environment-variable macros
     are inherited when NMAKE is called recursively. This option makes
     all macros available to the recursively called NMAKE session.
     See: Calling NMAKE Recursively
          Inherited Macros
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