anchor.diff:  
   # Install Ubuntu packages needed for IHaskell runtime
   RUN apt-get update && \
  -    apt-get install -y \
  -            libblas3 \
  -            libcairo2 \
  -            liblapack3 \
  -            libmagic1 \
  -            libpango-1.0-0 \
  -            libzmq5 \
  +    apt-get install -y libzmq5 \
           && \
       rm -rf /var/lib/apt/lists/*
   
  
positive.code: # Set up global project
  COPY --from=builder --chown=${NB_UID} /build/resolver.txt /tmp/
  RUN stack setup --resolver=$(cat /tmp/resolver.txt) --system-ghc
  
  # Set up env file
  RUN stack exec env --system-ghc > ${IHASKELL_DATA_DIR}/env
  
negative.code: 
  # Install Ubuntu packages needed for IHaskell build
  RUN apt-get update && \
      apt-get install -y libzmq3-dev \
          && \
      rm -rf /var/lib/apt/lists/*
  
  