anchor.diff:  FROM python:3
   
  -ENV RUSTUP_HOME=/usr/local/rustup \
  -    CARGO_HOME=/usr/local/cargo \
  -    PATH=/usr/local/cargo/bin:$PATH \
  -    LZ4_VERSION=1.8.1.2
  +ENV LZ4_VERSION=1.8.1.2
   
   RUN wget https://github.com/lz4/lz4/archive/v${LZ4_VERSION}.tar.gz -O liblz4.tar.gz && \
     tar -xvzf liblz4.tar.gz && \
  
positive.code:   make && \
    make install && \
    ldconfig
  
  RUN set -eux; \
      \
  # this "case" statement is generated via "update.sh"
      dpkgArch="$(dpkg --print-architecture)"; \
    case "${dpkgArch##*-}" in \
      amd64) rustArch='x86_64-unknown-linux-gnu'; rustupSha256='4b7a67cd971d713e0caef48b5754190aca19192d1863927a005c3432512b12dc' ;; \
      armhf) rustArch='armv7-unknown-linux-gnueabihf'; rustupSha256='622190c3f478a56563d45f6fbc1fab02d356b631c28a1beba2c3e4c68de3c14c' ;; \
      arm64) rustArch='aarch64-unknown-linux-gnu'; rustupSha256='a39d7643cdced9ad70a9927bbb0a861b579884f94793881b771d3a0f92c0ddd8' ;; \
      i386) rustArch='i686-unknown-linux-gnu'; rustupSha256='9e921fce4a2cc1f04095be6d623effdead0aab1261472e6933da9e6030330b90' ;; \
      *) echo >&2 "unsupported architecture: ${dpkgArch}"; exit 1 ;; \
    esac; \
      \
      url="https://static.rust-lang.org/rustup/archive/1.9.0/${rustArch}/rustup-init"; \
      wget "$url"; \
      echo "${rustupSha256} *rustup-init" | sha256sum -c -; \
      chmod +x rustup-init; \
      ./rustup-init -y --no-modify-path --default-toolchain 1.23.0; \
      rm rustup-init; \
      chmod -R a+w $RUSTUP_HOME $CARGO_HOME; \
      rustup --version; \
      cargo --version; \
      rustc --version;
  
  RUN pip install \
    numpy \
    cffi \
    setuptools \
    pytest && \
    wget https://github.com/scalableminds/webknossos-wrap/archive/master.tar.gz -O webknossos-wrap.tar.gz && \
    tar -xzvf webknossos-wrap.tar.gz && \
    cd webknossos-wrap-master/python && \
    python setup.py build && \
    python setup.py install
  
  
  RUN mkdir /app
  WORKDIR /app
  
negative.code: COPY requirements.txt /app
  COPY setup.py /app
  
  RUN pip install -r requirements.txt && \
    python setup.py install
  
  