anchor.diff:  #   sudo docker run -it -p 8080:8080 spiderfoot
   
   # Pull the base image.
  -FROM ubuntu:14.04
  +FROM ubuntu:16.04
   
   # Install pre-requisites.
   RUN apt-get update && apt-get install -y \
  
positive.code:   libxslt1-dev \
    python-pip  \
    python-dev \
    python-lxml \
    swig \
    --no-install-recommends
  
negative.code: RUN addgroup spiderfoot && \
      useradd -r -g spiderfoot -d /home/spiderfoot -s /sbin/nologin -c "SpiderFoot User" spiderfoot
  
  ENV SPIDERFOOT_VERSION 2.7.1
  
  # Download the specified release.
  WORKDIR /home
  