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Editorial Team
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Asked: 2026-05-27T14:24:51+00:00

I have seen a lot of posts on this topic, however I have not

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I have seen a lot of posts on this topic, however I have not found regarding this warning:

CMake Warning:
   Manually-specified variables were not used by the project:

   BUILD_PYTHON_SUPPORT

when I compile with cmake. When building OpenCV with this warning, it turns out that it doesn’t include python support (surprise).

I use this command to compile the build-files 

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_PYTHON_SUPPORT=ON -D BUILD_EXAMPLES=ON ..

I have installed python-dev.

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1 Answer

  1. Editorial Team

    It looks like you’re using an old install guide. Use BUILD_NEW_PYTHON_SUPPORT instead.

    So, execute CMake like this:

    cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_NEW_PYTHON_SUPPORT=ON -D BUILD_EXAMPLES=ON ..

    Also, if you use the CMake GUI, it is easier to see all of the options you can set for OpenCV (there are so many it’s quite tedious to type them all on the command-line). To get it for Ubuntu, do this:

    sudo apt-get install cmake-qt-gui
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