我用这个命令在树莓派中安装OpenCv：
pip3 install opencv-python
pip3 install opencv-contrib-python
sudo apt-get install libatlas-base-dev
sudo apt-get install libjasper-dev
sudo apt-get install libqtgui4
sudo apt-get install python3-pyqt5
sudo apt-get update
sudo apt-get install libhdf5-dev
sudo apt-get update
sudo apt-get install libhdf5-serial-dev
sudo apt install libqt4-test
sudo apt-get -y install libv4l-dev v4l-utils
sudo modprobe bcm2835-v4l2
现在我决定将openmp用于4个处理器内核。在教程中说使用cmake，然后使用以下命令安装cmake：
sudo apt-get install build-essential cmake cmake-curses-gui pkg-config
并安装此自由：
libjpeg-dev
libtiff5-dev
libjasper-dev
libpng12-dev
libavcodec-dev
libavformat-dev
libswscale-dev
libeigen3-dev
libxvidcore-dev
libx264-dev
libgtk2.0-dev
我如何构建cmake（WITH_OPENMP = ON）和opencv？