title: How do you conda install a library in an environment created with virtualenv?
body: <p>I'm working on a (python) project where the choice was to create a virtual environment using virtualenv. However, one of the project dependencies can't be installed through pip on macOS due to this bug: <a href="https://github.com/streamlit/streamlit/issues/283" rel="noreferrer">https://github.com/streamlit/streamlit/issues/283</a></p>
  
  <p>The workaround is to conda install one of the dependencies to bypass the gcc compiler.</p>
  
  <p>How do you conda install something in a virtual environment not created with conda?</p>