anchor.diff:  # gpg: key F73C700D: public key "Larry Hastings <larry@hastings.org>" imported
   ENV GPG_KEY 97FC712E4C024BBEA48A61ED3A5CA953F73C700D
   
  -ENV PYTHON_VERSION 3.5.1
  +ENV PYTHON_VERSION 3.4.4
   
   # if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
   ENV PYTHON_PIP_VERSION 8.1.2
  
positive.code: 	&& make -j$(getconf _NPROCESSORS_ONLN) \
  	&& make install \
  	&& pip3 install --no-cache-dir --upgrade --ignore-installed pip==$PYTHON_PIP_VERSION \
    && apk add --update gfortran py-pip build-base py-numpy@testing \
  	&& find /usr/local -depth \
  		\( \
  		    \( -type d -a -name test -o -name tests \) \
  
negative.code: FROM alpine:3.3
  
  # http://bugs.python.org/issue19846
  # > At the moment, setting "LANG=C" on a Linux system *fundamentally breaks Python 3*, and that's not OK.
  