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:     wget curl \
      git \
      build-essential \
      less nano \
      python python-pip groff \
      rlwrap \
    && rm -rf /var/lib/apt/lists/* \
  
negative.code: FROM ubuntu:15.04
  MAINTAINER Cyrille Le Clerc <cleclerc@cloudbees.com>
  
  #
  # Licensed to the Apache Software Foundation (ASF) under one or more
  # contributor license agreements.  See the NOTICE file distributed with
  # this work for additional information regarding copyright ownership.
  # The ASF licenses this file to You under the Apache License, Version 2.0
  # (the "License"); you may not use this file except in compliance with
  # the License.  You may obtain a copy of the License at
  #
  #    http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  #
  
  #################################################
  # Inspired by
  