anchor.diff:  
   # Install prerequisites
   RUN apt-get update &&  \
  -	DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends --no-install-suggests -y \
  +	apt-get install --no-install-recommends --no-install-suggests -y \
         apt-transport-https \
         ca-certificates \
         dirmngr \
  
positive.code: #
  FROM debian:stretch-slim
  MAINTAINER Christian chriswayg@gmail.com
  
  # If no Nickname is set, a random string will be added to 'Tor4'
  ENV TOR_NICKNAME=Tor4 \
  
negative.code:   echo "deb http://deb.torproject.org/torproject.org obfs4proxy main" >> /etc/apt/sources.list.d/tor-apt-sources.list && \
  # Install tor and obfs4proxy & backup torrc
    apt-get update && \
    apt-get install --no-install-recommends --no-install-suggests -y \
      tor \
      deb.torproject.org-keyring \
      obfs4proxy && \
  