anchor.diff:      # install flask
       && pip install flask \
       \
  +    # install pykafka-tools
  +    && pip install git+https://github.com/smueller18/pykafka-tools.git@0.1.7#egg=pykafka-tools --process-dependency-links --allow-all-external \
  +    \
       # delete build dependencies
       && apk del .build-deps \
       && apk del .librdkafka \
  
positive.code:             librdkafka-dev \
      && pip install pykafka \
      \
      # install avro
      && pip install avro_python3 \
      \
  
negative.code:           gcc \
            python3-dev \
            musl-dev \
            # for numpy
            linux-headers \
            g++ \
            # end for numpy
            postgresql-dev \
            curl \
            git \
      \
      # install pykafka
      && apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/main/ \
  