anchor.diff:  RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
   
   # install go-lang
  -RUN GO_VERSION=1.7.1 && \
  -    GO_HASH=43ad621c9b014cde8db17393dc108378d37bc853aa351a6c74bf6432c1bbd182 && \
  +RUN GO_VERSION=1.7.3 && \
  +    GO_HASH=508028aac0654e993564b6e2014bf2d4a9751e3b286661b0b0040046cf18028e && \
       curl -fsSL https://golang.org/dl/go${GO_VERSION}.linux-amd64.tar.gz -o golang.tar.gz && \
       echo "${GO_HASH}  golang.tar.gz" | sha256sum -c - && \
       tar -C /usr/local -xzf golang.tar.gz && \
  
positive.code:         apt-get download libunwind8-dev:${a} 2> /dev/null && \
          apt-get download libunwind8:${a} 2> /dev/null && \
          apt-get download liblzma5:${a} 2> /dev/null; \
      done
  
  RUN for d in *.deb; do \
  
negative.code: FROM ubuntu:xenial
  MAINTAINER Bassam Tabbara <bassam.tabbara@quantum.com>
  
  #
  # install build tools, compilers and cross compilers for all supported platforms
  #
  
  RUN echo "deb [arch=amd64] http://archive.ubuntu.com/ubuntu xenial main universe restricted" > /etc/apt/sources.list &&\
      echo "deb [arch=amd64] http://archive.ubuntu.com/ubuntu xenial-updates main universe restricted" >> /etc/apt/sources.list &&\
      echo "deb [arch=arm64] http://ports.ubuntu.com/ xenial main universe restricted" >> /etc/apt/sources.list &&\
      echo "deb [arch=arm64] http://ports.ubuntu.com/ xenial-updates main universe restricted" >> /etc/apt/sources.list &&\
      dpkg --add-architecture arm64 && \
      apt-get update && \
      DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends \
          build-essential \
          ca-certificates \
          ccache \
          clang \
          cmake \
          crossbuild-essential-arm64 \
          curl \
          cython \
          docker.io \
          git \
          jq \
          libxml2-dev \
          llvm-dev \
          mingw-w64 \
          patch \
          python \
          python-dev \
          rsync \
          runit \
          sudo \
          uuid-dev \
          xz-utils \
          yasm \
          zip
  
  # install the OSX cross compilers. see https://github.com/tpoechtrager/osxcross
  RUN OSXCROSS_COMMIT_HASH=86879571d33ff7252a55d777609742561dba9953 && \
  