title: Can't find Brew installed packages on Mac M1 in Pycharm
body: <p>I'm having trouble installing packages and using them in Pycharm. I've followed various threads (I'm new to Macs and seem to have tried everything) now I'm stuck.</p>
  <p>In this case, I want to use the package xgboost.</p>
  <p>I have brew installed, after launching a terminal using Rosetta:</p>
  <p>%brew install xgboost
  Warning: xgboost 1.3.3 is already installed and up-to-date.</p>
  <p>It appears installed OK here:
  /opt/homebrew/Cellar/xgboost</p>
  <p>I also have Python installed here:
  /opt/homebrew/Cellar/python@3.9</p>
  <p>But no matter how I configure an Interpreter in Pycharm, I can't seem to get the package recognised.</p>
  <p>Where have I gone wrong?</p>