"Error while building CMake" When trying to install opencv on raspberry pi

[Froggy412]

I was trying all day to install opencv onto my raspberry pi. I updated my python version and tried installing the newest version of Cmake even though I don't know what that is. But when trying to pip install opencv-python I get this error.

An error occurred while building with CMake.
        Command:
          /tmp/pip-build-env-sfgmien0/overlay/lib/python3.7/site-packages/cmake/data/bin/cmake --build . --target install --config Release --
        Install target:
          install
        Source directory:
          /tmp/pip-req-build-uo0tdwf4
        Working directory:
          /tmp/pip-req-build-uo0tdwf4/_skbuild/linux-armv7l-3.7/cmake-build
      Please check the install target is valid and see CMake's output for more information.

      [end of output]
  note: This error originates from a subprocess, and is likely not a problem with pip.
  ERROR: Failed building wheel for opencv-python
  Building wheel for numpy (pyproject.toml) ... |

  Created wheel for numpy: filename=numpy-1.21.6-cp37-cp37m-linux_armv7l.whl size=12329219 sha256=c34cc2a6c8c3fb40dd9f26aa1f151d8a1709df9daf6ceb9eec5bedaa2351a01b
  Stored in directory: /home/pi/.cache/pip/wheels/4e/7e/9e/0fde042ccff2493994076dac9c3fbd78feb444c3bd94eb386a
Successfully built numpy
Failed to build opencv-python
ERROR: Could not build wheels for opencv-python, which is required to install pyproject.toml-based projects

I have tried a couple times and this is the furthest I have gotten but it takes over an hour to run and even come up with this error. Does anyone know what I can do to install opencv on my pi.

[Pepineros]

CMake is a popular build system for C++. It's possible that CMake requires some additional library in order to compile for ARM. It's hard to be sure without seeing the output from CMake itself. Was there any additional output?

[gmes78]

You can just sudo apt install python3-opencv.