CMake Warning at source_subfolder/cmake/OpenCVDetectPython.cmake:81 (message): CMake's 'find_host_package(PythonInterp 2.7)' found wrong Python version: PYTHON_EXECUTABLE=/opt/pyenv/versions/3.7.5/bin/python PYTHON_VERSION_STRING=3.7.5 Consider providing the 'PYTHON2_EXECUTABLE' variable via CMake command line or environment variables Call Stack (most recent call first): source_subfolder/cmake/OpenCVDetectPython.cmake:271 (find_python) source_subfolder/CMakeLists.txt:606 (include) Traceback (most recent call last): File "", line 1, in ModuleNotFoundError: No module named 'numpy' In file included from /home/conan/w/cci_PR-3465/.conan/data/opencv/3.4.12/_/_/build/7e6ddc4096fb73d73cfcb03638c6f05156438a7f/source_subfolder/modules/imgcodecs/src/loadsave.cpp:47: In file included from /home/conan/w/cci_PR-3465/.conan/data/opencv/3.4.12/_/_/build/7e6ddc4096fb73d73cfcb03638c6f05156438a7f/source_subfolder/modules/imgcodecs/src/grfmts.hpp:53: In file included from /home/conan/w/cci_PR-3465/.conan/data/opencv/3.4.12/_/_/build/7e6ddc4096fb73d73cfcb03638c6f05156438a7f/source_subfolder/modules/imgcodecs/src/grfmt_exr.hpp:53: In file included from /home/conan/w/cci_PR-3465/.conan/data/openexr/2.5.2/_/_/package/857371782dc079800b09c2d6d195e4a34d419c22/include/OpenEXR/ImfInputFile.h:48: In file included from /home/conan/w/cci_PR-3465/.conan/data/openexr/2.5.2/_/_/package/857371782dc079800b09c2d6d195e4a34d419c22/include/OpenEXR/ImfTiledOutputFile.h:50: In file included from /home/conan/w/cci_PR-3465/.conan/data/openexr/2.5.2/_/_/package/857371782dc079800b09c2d6d195e4a34d419c22/include/OpenEXR/ImfGenericOutputFile.h:40: In file included from /home/conan/w/cci_PR-3465/.conan/data/openexr/2.5.2/_/_/package/857371782dc079800b09c2d6d195e4a34d419c22/include/OpenEXR/ImfXdr.h:108: /home/conan/w/cci_PR-3465/.conan/data/openexr/2.5.2/_/_/package/857371782dc079800b09c2d6d195e4a34d419c22/include/OpenEXR/half.h:104:19: error: expected ';' at end of declaration list half (half &&) noexcept = default; ^ /home/conan/w/cci_PR-3465/.conan/data/openexr/2.5.2/_/_/package/857371782dc079800b09c2d6d195e4a34d419c22/include/OpenEXR/half.h:125:35: error: expected ';' at end of declaration list half & operator = (half &&h) noexcept = default; ^ 2 errors generated. make[2]: *** [source_subfolder/modules/imgcodecs/CMakeFiles/opencv_imgcodecs.dir/src/loadsave.cpp.o] Error 1 make[2]: *** Waiting for unfinished jobs.... make[1]: *** [source_subfolder/modules/imgcodecs/CMakeFiles/opencv_imgcodecs.dir/all] Error 2 make[1]: *** Waiting for unfinished jobs.... make: *** [all] Error 2 opencv/3.4.12: WARN: Build folder is dirty, removing it: /home/conan/w/cci_PR-3465/.conan/data/opencv/3.4.12/_/_/build/7e6ddc4096fb73d73cfcb03638c6f05156438a7f opencv/3.4.12: ERROR: Package '7e6ddc4096fb73d73cfcb03638c6f05156438a7f' build failed opencv/3.4.12: WARN: Build folder /home/conan/w/cci_PR-3465/.conan/data/opencv/3.4.12/_/_/build/7e6ddc4096fb73d73cfcb03638c6f05156438a7f ERROR: opencv/3.4.12: Error in build() method, line 192 cmake.build() ConanException: Error 2 while executing cmake --build '/home/conan/w/cci_PR-3465/.conan/data/opencv/3.4.12/_/_/build/7e6ddc4096fb73d73cfcb03638c6f05156438a7f/build_subfolder' '--' '-j3'