anchor.diff:    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 && \
  -  DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends --no-install-suggests -y \
  +  apt-get install --no-install-recommends --no-install-suggests -y \
       tor \
       deb.torproject.org-keyring \
       obfs4proxy && \
  
positive.code: 
  # Install prerequisites
  RUN apt-get update &&  \
  	DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends --no-install-suggests -y \
        apt-transport-https \
        ca-certificates \
        dirmngr \
  
negative.code: #
  FROM debian:stretch-slim
  MAINTAINER Christian chriswayg@gmail.com
  
  # Environment setting only used during build
  ARG DEBIAN_FRONTEND=noninteractive
  
  # If no Nickname is set, a random string will be added to 'Tor4'
  ENV TOR_NICKNAME=Tor4 \
  