title: CMake error when configuring OpenCV
body: <p>I am using cmake-gui trying to build opencv but get this error:</p>
  
  <pre><code>CMake Error at cmake/OpenCVGenConfig.cmake:134 (math):
    math cannot parse the expression: "8 * ": syntax error, unexpected $end,
    expecting exp_OPENPARENT or exp_NUMBER (4)
  Call Stack (most recent call first):
    CMakeLists.txt:649 (include)
  </code></pre>
  
  <p>This is my first experience with cmake so I am not sure where to turn. I have looked at the OpenCVGenConfig.cmake file but I am clueless about its syntax.  I blew away everything, downloaded the opencv tarball again, but still get the same error. So it does not appear that it is a typo/error in the OpenCVGenConfig.cmake file but in the processing of the "math" command.  I can not seem to find anything relating to a "math" command in the Cmake documentation.</p>
  
  <p>Any ideas?</p>
  
  <p>-Andres </p>