title: Getting the parent directory inside Makefile.msc
body: <p>I have third-party Makefile.msc (zlib) which is in a subdirectory of the source (zlib\win32). It seems you are meant to run win32/Makefile.msc directly from the source directory. However, I need to make a number of different versions, and would like the results separated out. I would also like to call nmake from a directory other than the source directory. </p>
  
  <p>I tried SRCDIR = ./.. but it seems that .. is not supported. How can I get to the parent directory?</p>