title: Django Pillow delete pip_build?
body: <p>I'm unable to install Pillow due to a previous installation that failed. </p>
  
  <p>This left some Pillow-files in a folder called "pip_build" in my temp. I need to delete it manually. But I cant delete it because it's files is open in some other program (?). I've tried closing my programs but I cant delete the folder.. Any ideas?</p>