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
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 (from Command errored out with exit status 1: /usr/local/bin/python /tmp/pip-standalone-pip-82li9ftk/ install --ignore-installed --no-user --prefix /tmp/pip-build-env-97yun0ut/overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i -- 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:,,,,,,,,,,,
ERROR: No matching distribution found for opencv-python
Cleaning up file based variables
ERROR: Job failed: exit code 1