anchor.diff:  # Dockerfile for installing the necessary dependencies for building Hadoop.
   # See BUILDING.txt.
   
  -FROM ubuntu:xenial
  +FROM ubuntu:bionic
   
   WORKDIR /root
   
  
positive.code:         libsasl2-dev \
          libsnappy-dev \
          libssl-dev \
          libtool \
          libzstd1-dev \
          locales \
  
negative.code: RUN apt-get -q update \
      && apt-get -q install -y --no-install-recommends \
          apt-utils \
          bats \
          build-essential \
          bzip2 \
          clang \
          cmake \
          curl \
          doxygen \
          fuse \
  