anchor.diff:      wget --directory-prefix=/tmp https://releases.hashicorp.com/terraform/${TERRAFORM_VERSION}/terraform_${TERRAFORM_VERSION}_linux_amd64.zip && \
       unzip /tmp/terraform_${TERRAFORM_VERSION}_linux_amd64.zip -d /usr/local/bin && \
       wget --directory-prefix=/tmp https://github.com/hashicorp/atlas-upload-cli/releases/download/v${ATLAS_CLI_VERSION}/atlas-upload-cli_${ATLAS_CLI_VERSION}_linux_amd64.tar.gz && \
  -    ls -All /tmp && \
  -    tar xzf /tmp/atlas-upload-cli_${ATLAS_CLI_VERSION}_linux_amd64.tar.gz -C /usr/local/bin && \
  -    rm -rf /tmp/*
  +    tar xzf /tmp/atlas-upload-cli_${ATLAS_CLI_VERSION}_linux_amd64.tar.gz -C /usr/local/bin
   
   # install Virtualbox (Example version: 5.0.14_105127_el7-1)
   RUN export VIRTUALBOX_VERSION=latest && \
  
positive.code:       then yum install -y VirtualBox-5.0 ; \
        else yum install -y VirtualBox-5.0-${VIRTUALBOX_VERSION} ; \
      fi && \
      yum autoremove -y \
        tar \
        unzip \
        wget && \
      yum clean all && rm -rf /var/cache/yum/*
  
negative.code:       unzip \
        tar \
        gzip \
        wget
  
  # install Hashicorp tools
  RUN export PACKER_VERSION=0.12.1 && \
      export VAGRANT_VERSION=1.9.1 && \
      export OTTO_VERSION=0.2.0 && \
      export TERRAFORM_VERSION=0.8.2 && \
      export ATLAS_CLI_VERSION=0.2.0 && \
      wget --directory-prefix=/tmp https://releases.hashicorp.com/packer/${PACKER_VERSION}/packer_${PACKER_VERSION}_linux_amd64.zip && \
      unzip /tmp/packer_${PACKER_VERSION}_linux_amd64.zip -d /usr/local/bin && \
  