anchor.diff:  # OpenJDK8
   # rlwrap is for azure-cli
   # groff is for aws-cli
  +# tree is convenient for troubleshooting builds
   #========================
   RUN apt-get update -qqy \
     && apt-get -qqy --no-install-recommends install \
  
positive.code: FROM ubuntu:15.04
  MAINTAINER Cyrille Le Clerc <cleclerc@cloudbees.com>
  
  #################################################
  # Inspired by
  
negative.code:     wget curl \
      git \
      build-essential \
      less nano tree \
      python python-pip groff \
      rlwrap \
    && rm -rf /var/lib/apt/lists/* \
  