anchor.diff:  
   WORKDIR /Python-$PYTHON_VERSION
   RUN ./configure --enable-optimizations \
  -    && make -j $(nproc) \
  +    && make -j "$(nproc)" \
       && make install
   
   WORKDIR /
  
positive.code:     && apt-get clean \
      && rm -rf /var/lib/apt/lists/*
  
  RUN wget https://raw.github.com/miyagawa/cpanminus/master/cpanm -O /usr/bin/cpanm \
      && chmod +x /usr/bin/cpanm \
      && cpanm --notest \
          Cairo \
  
negative.code:     && rm -rf /var/lib/apt/lists/*
  
  #  install the packages necessary to build Python source:
  RUN apt update && apt install -y --no-install-recommends build-essential zlib1g-dev libncurses5-dev libgdbm-dev \
      libnss3-dev libssl-dev libreadline-dev libffi-dev libbz2-dev \
      libncursesw5-dev libsqlite3-dev tk-dev libc6-dev ca-certificates \
      && apt-get clean \
  