anchor.diff:      --with-system-ffi \
       --without-ensurepip \
     && make -j "$(nproc)" \
  -# set thread stack size to 1MB so we don't segfault before we hit sys.getrecursionlimit()
  -# https://github.com/alpinelinux/aports/commit/2026e1259422d4e0cf92391ca2d3844356c649d0
  +
       EXTRA_CFLAGS="-DTHREAD_STACK_SIZE=0x100000" \
     && make install \
     \
  
positive.code: # ensure local python is preferred over distribution python
  ENV PATH /usr/local/bin:$PATH
  
  # At the moment, setting "LANG=C" on a Linux system *fundamentally breaks Python 3.x; 
  # that is a bug documented at: http://bugs.python.org/issue19846
  
  ENV LANG C.UTF-8
  
negative.code:   && ln -s python3-config python-config
  
  # if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
  
  ENV PYTHON_PIP_VERSION 18.1
  
  RUN set -ex; \
  