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Hi,

It may need to be linked with libatomic library.
I could build by adding -DCMAKE_SHARED_LINKER_FLAGS='-latomic' to cmake.

Here is my cmake settings:

OPENCV_VERSION=4.1.1
cmake -DCMAKE_BUILD_TYPE=Release \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D OPENCV_EXTRA_MODULES_PATH=${HOME}/opencv_contrib-${OPENCV_VERSION}/modules \
    -D ENABLE_VFPV3=ON \
    -D ENABLE_NEON=ON \
    -D BUILD_TESTS=OFF \
    -D WITH_TBB=OFF \
    -D INSTALL_PYTHON_EXAMPLES=ON \
    -D OPENCV_SKIP_PYTHON_LOADER=ON \
    -D OPENCV_PYTHON2_INSTALL_PATH=/usr/local/lib/python2.7/dist-packages \
    -D OPENCV_PYTHON3_INSTALL_PATH=/usr/local/lib/python3.7/dist-packages \
    -D OPENCV_GENERATE_PKGCONFIG=ON \
    -D BUILD_EXAMPLES=ON \
    -DCMAKE_SHARED_LINKER_FLAGS='-latomic' \
    ..

Environment:

• Raspberry Pi 4B (4GB) with fan
• 2019-07-10-raspbian-buster (apt upgrade on Jul27'19)