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Enabling OpenMP while building OpenCV libraries

hi all

I am trying to build libraries for openCV. i see a log in cmake like this

  Other third-party libraries:
    Use IPP:                     NO
    Use Eigen:                   YES (ver 3.2.0)
    Use TBB:                     YES (ver 4.2 interface 7000)
    Use OpenMP:                  NO
    Use GCD                      NO
    Use Concurrency              NO
    Use C=:                      NO
    Use Cuda:                    NO
    Use OpenCL:                  NO

You can see that it has OpenMP switched off. Is there a way to enable it. My platform details are as below :

    Host:                        Windows 6.1 AMD64
    CMake generator:             Visual Studio 11 Win64
    CMake build tool:            C:/Windows/Microsoft.NET/Framework/v4.0.30319/MSBuild.exe
    MSVC:                        1700