anchor.diff:  # required for ruby: libcurl4-openssl-dev
   # required for python: python3, pkg-config
   # hadolint ignore=DL3008
  -RUN apt-get update && apt-get install -y --no-install-recommends \
  +RUN apt-get update && apt-get -y dist-upgrade && apt-get install -y --no-install-recommends \
       apt-transport-https \
       ca-certificates \
       curl \
  
positive.code: FROM ubuntu:xenial as clang_context
  
  # hadolint ignore=DL3008
  RUN apt-get update && apt-get install -y --no-install-recommends \
      xz-utils \
      wget \
      ca-certificates \
  
negative.code: ENV MDL_VERSION=0.5.0
  
  # hadolint ignore=DL3008
  RUN apt-get update && apt-get -y dist-upgrade && apt-get install -y --no-install-recommends \
      apt-transport-https \
      ca-certificates \
      gnupg2 \
  