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I am not able to build a Python wrapper module for my C library via CMake and Swig for Python3. Everything works fine for Python2.x but it looks like CMake cannot find Python3. I already looked around and tried a couple of things. For example, my python executable links to Python3, as I read CMake will find this version first. Please see here the SWIG part of the CMakeLists.txt : FIND_PACKAGE(SWIG REQUIRED) INCLUDE(${SWIG_USE_FILE}) FIND_PACKAGE(PythonInterp 3) FIND_PACKAGE(PythonLibs 3) FIND_PATH(PYTHON_INCLUDE_PATH Python.h /usr/include /usr/local/include) INCLUDE_DIRECTORIES(${PYTHON_INCLUDE_DIRS}) INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}) SET(CMAKE_SWIG_FLAGS "") SET_SOURCE_FILES_PROPERTIES(kissCT3.i PROPERTIES CPLUSPLUS ON) #SET_SOURCE_FILES_PROPERTIES(kissCT3.i PROPERTIES SWIG_FLAGS "-includeall -py3") SWIG_ADD_MODULE(kissCT3 python kissCT3.i) SWIG_LINK_LIBRARIES(kissCT3 libct2d matio kissfft ${PYTHON_LIBRARIES}) Unfortunately, the output after calling cmake shows that only python2.7 is found: -- Found SWIG: /usr/bin/swig2.0 (found version "2.0.4") -- Found PythonInterp: /usr/bin/python2.7 (Required is at least version "3") -- Found PythonLibs: /usr/lib/libpython2.7.so (Required is at least version "3") -- Configuring done -- Generating done

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