anchor.diff: -FROM debian:stretch
  +FROM debian:buster
   ENV LANG C.UTF-8
   ENV LANGUAGE C.UTF-8
   ENV LC_ALL C.UTF-8
  
positive.code: 
  ARG PARALLEL=2
  WORKDIR /app/deps
  ARG CPPCMS_VERSION="1.2.0"
  RUN curl -o cppcms-${CPPCMS_VERSION}.tar.bz -L \
          "https://sourceforge.net/projects/cppcms/files/cppcms/${CPPCMS_VERSION}/cppcms-${CPPCMS_VERSION}.tar.bz2/download" \
      && tar -xjvf cppcms-${CPPCMS_VERSION}.tar.bz \
  
negative.code:     && make install \
      && cd /app/deps \
      && rm -Rf jansson-${JANSSON_VERSION}
  ARG LIBJWT_VERSION="1.11.0"
  RUN curl -o libjwt-v${LIBJWT_VERSION}.tar.gz -L \
          "https://github.com/benmcollins/libjwt/archive/v${LIBJWT_VERSION}.tar.gz" \
      && tar -xvzf libjwt-v${LIBJWT_VERSION}.tar.gz \
  