anchor.diff:  FROM project5/base
   MAINTAINER benjamin.gemmill@gmail.com
   
  -ARG LLVM_VERSION=8
  +ARG LLVM_VERSION=9
   
   # clang repository from https://apt.llvm.org
   # cmake repository from https://apt.kitware.com/
  
positive.code:       default-jdk \
        #python python-dev python-pip \
        python3 python3-dev python3-pip \
        clang-${LLVM_VERSION} lldb-${LLVM_VERSION} lld-${LLVM_VERSION} \
        cmake make ccache \
        flex bison \
        libssl-dev libz-dev \
  
negative.code: # Clang
  RUN update-alternatives --install /usr/bin/clang clang /usr/bin/clang-${LLVM_VERSION} 1000 \
    && update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-${LLVM_VERSION} 1000 \
    && update-alternatives --install /usr/bin/ld ld /usr/bin/ld.lld-${LLVM_VERSION} 1000
    #&& update-alternatives --install /usr/bin/lldb lldb /usr/bin/lldb-${LLVM_VERSION} 1000
  ENV CC=clang
  ENV CXX=clang++
  
  