anchor.diff:      && apt-get update \
       && apt-get upgrade --assume-yes
   
  -ARG rust_version=1.41.0
   ARG cxx_package
  -ARG cc
  -ARG cxx
   
   RUN apt-get update \
       && apt-get install --assume-yes --no-install-recommends \
  
positive.code: USER builder
  WORKDIR /home/builder/src
  
  RUN wget -O $HOME/rustup.sh --secure-protocol=TLSv1_2 https://sh.rustup.rs \
      && chmod +x $HOME/rustup.sh \
      && $HOME/rustup.sh -y \
  
negative.code:     && chmod a+w $HOME/.cargo
  
  ENV HOME /home/builder
  
  ARG cc
  ARG cxx
  
  ENV CC=$cc
  ENV CXX=$cxx
  