anchor.diff:  RUN pip install -e /usr/src/evennia --trusted-host pypi.python.org
   
   # add the game source when rebuilding a new docker image from inside
  -# a game dir 
  +# a game dir
   ONBUILD ADD . /usr/src/game
   
   # make the game source hierarchy persistent with a named volume.
  
positive.code: MAINTAINER www.evennia.com
  
  # install compilation environment
  RUN apk update && apk add python py-pip python-dev py-setuptools gcc musl-dev jpeg-dev zlib-dev bash
  
  # add the project source
  ADD . /usr/src/evennia
  
negative.code: #   install `docker` (http://docker.com)
  #
  # Usage:
  #    cd to a folder where you want your game data to be (or where it already is).
  #
  #	docker run -it -p 4000:4000 -p 4001:4001 -p 4005:4005 -v $PWD:/usr/src/game evennia/evennia
  #
  #    (If your OS does not support $PWD, replace it with the full path to your current
  #    folder).
  #
  #    You will end up in a shell where the `evennia` command is available. From here you
  