title: Specify opencv with CMAKE_ARGS in conda yml
body: <p>How can I specify conda (in the <code>environment.yml</code>) to install <code>opencv-contrib-python</code> with pip while specifying <code>CMAKE_ARGS</code>.</p>
  <p>Basically, how can I specify conda to run this command in the <code>environment.yml</code> file</p>
  <pre><code>CMAKE_ARGS=&quot;-DOPENCV_ENABLE_NONFREE=ON&quot; pip install --no-binary=opencv-contrib-python opencv-contrib-python
  </code></pre>
  <p>As it stands if I export the environment via <code>conda env export &gt; environment.yml</code>, it just specifies the version of opencv like so</p>
  <pre><code>name: test
  channels:
    - conda-forge
    - pkgs/main
    - defaults
  dependencies:
    - Bunch of conda dependencies
    - pip:
      - opencv-contrib-python==4.5.1.48
  prefix: /home/an/miniconda3/envs/test
  </code></pre>