Compile OpenCV3.2 with Python2 on Windows 7

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I am able to run cmake-gui with the default settings and compile and install OpenCV 3.2.0 with Visual Studio 14 2015 Win64 on Windows 7, if I don't use Python 2 or 3. The C++ samples programs work as expected.

I am now trying to compile, including WITH_PYTHON2 and WITH_XIMEA (I don't have Python 3 installed). Cmake finds the Python2.7 (64bit) files as follows:

PYTHON2_EXECUTABLE  C:/Python27/python.exe
PYTHON2_INCLUDE_DIR  C:/Python27/include
PYTHON2_INCLUDE_DIR2 
PYTHON2_LIBRARY C:/Python27/libs/python27.lib
PYTHON2_LIBRARY_DEBUG  PYTHON_DEBUG_LIBRARY-NOTFOUND
PYTHON2_PACKAGES_PATH  C:/Python27/Lib/site-packages

but then concludes that both the python2 and python3 modules will be "Unavailable":`

 OpenCV modules:
    To be built:                 cudev core cudaarithm flann imgproc ml objdetect video cudabgsegm cudafilters cudaimgproc cudawarping imgcodecs photo shape videoio cudacodec highgui ts features2d calib3d cudafeatures2d cudalegacy cudaobjdetect cudaoptflow cudastereo stitching superres videostab
    Disabled:                    world
    Disabled by dependency:      -
    Unavailable:                 java python2 python3 viz`

What is missing? Do I need some PYTHON2_LIBRARY_DEBUG for this to work, if so where do I get that? Thanks for any hints!