trying to improve online docs rendering

1 job for master in 24 minutes and 1 second (queued for 1 minute and 46 seconds)
Name Stage Failure
failed
pages Deploy
    ERROR: Failed building wheel for cmake
Failed to build cmake
ERROR: Could not build wheels for cmake which use PEP 517 and cannot be installed directly
----------------------------------------
WARNING: Discarding https://files.pythonhosted.org/packages/46/3e/1b61ed8e501c5d44239602c2e83d2ae43d01f9ec0a570c7cc43169c873bb/opencv-python-3.4.10.37.tar.gz#sha256=89e4b0680d3de1ec1849ee1bae9910a711f3a3303bd6e76c20321b52849cd11c (from https://pypi.org/simple/opencv-python/). Command errored out with exit status 1: /usr/local/bin/python /tmp/pip-standalone-pip-82li9ftk/__env_pip__.zip/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-97yun0ut/overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- setuptools wheel scikit-build cmake pip 'numpy==1.11.3; python_version=='"'"'3.5'"'"'' 'numpy==1.13.3; python_version=='"'"'3.6'"'"'' 'numpy==1.14.5; python_version=='"'"'3.7'"'"'' 'numpy==1.17.3; python_version>='"'"'3.8'"'"'' Check the logs for full command output.
ERROR: Could not find a version that satisfies the requirement opencv-python (from versions: 3.4.10.37, 3.4.11.39, 3.4.11.41, 3.4.11.43, 3.4.11.45, 3.4.13.47, 4.3.0.38, 4.4.0.40, 4.4.0.42, 4.4.0.44, 4.4.0.46, 4.5.1.48)
ERROR: No matching distribution found for opencv-python
Cleaning up file based variables
ERROR: Job failed: exit code 1