title: pip install matplotlib does not work under termux (Android)
body: <p>I installed termux on my Android tablet, and was able to successfully install Python 3.9 and Numpy, but not matplotlib.  Apparently the .whl was downloaded and cached, and now when I try to install, whether using pip or pkg it attempts to use the cached .whl file.  I tried clearing memory and reinstalling everything from scratch, but it still downloads the same .whl, with the same result.  (The termux wiki provided no clues that I could find)
  Anybody have a work around or fix?</p>