NMAKE Help (nmake.hlp) (Table of Contents; Topic list)
/B Option
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     Syntax:  /B
 
     Tells NMAKE to execute a dependency even if time stamps are equal.
 
     Most operating systems assign time stamps with a resolution of 2
     seconds. If your commands execute quickly, NMAKE may conclude that
     a file is up-to-date when in fact it is not. This option may
     result in some unnecessary build steps but is recommended when
     running NMAKE on very fast systems.
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