anchor.diff:          php${PHP_VERSION_MAJOR}-phar \
   #        php${PHP_VERSION_MAJOR}-readline \
           php${PHP_VERSION_MAJOR}-session \
  +        php${PHP_VERSION_MAJOR}-xdebug \
           php${PHP_VERSION_MAJOR}-xml \
           php${PHP_VERSION_MAJOR}-zip \
           php${PHP_VERSION_MAJOR}-zlib \
  
positive.code: 
  ENV PHP_VERSION           ${VERSION}
  ENV PHP_VERSION_MAJOR     7
  ENV PECL_XDEBUG_VERSION   2.5.0
  ENV PECL_YAML_VERSION     2.0.0
  
  RUN set -x \
  
negative.code:     && make \
  #    && make test \
      && make install \
      && rm -rf /tmp/yaml* \
      ## webgrind (xdebug profile analyzer)
      && mkdir -p /code \
      && cd /code \
  