anchor.diff:    && rm python.tar.xz \
     \
     && apk add --no-cache --virtual .build-deps  \
  +    build-base \
       bzip2-dev \
       coreutils \
       dpkg-dev dpkg \
  
positive.code: 
  # install ca-certificates so that HTTPS works consistently
  # other runtime dependencies for Python are installed later
  RUN apk add --no-cache ca-certificates
  
  ENV GPG_KEY 0D96DF4D4110E5C43FBFB17F2D347EA6AA65421D
  ENV PYTHON_VERSION 3.6.9
  
negative.code:     libc-dev \
      libffi-dev \
      libnsl-dev \
      libressl-dev \
      libtirpc-dev \
      linux-headers \
      make \
      ncurses-dev \
      openssl-dev \
      pax-utils \
      pcre-dev \
      readline-dev \
      sqlite-dev \
      tcl-dev \
  