anchor.diff:  
   # https://hub.docker.com/r/nazarpc/php/~/dockerfile/
   RUN docker-php-ext-install \
  -                mysql mysqli pdo pdo_mysql \
  +                mysqli pdo pdo_mysql \
   		bcmath \
   		bz2 \
                   curl \
  
positive.code: 
  # php libraries
  # https://docs.docker.com/samples/library/php/#how-to-install-more-php-extensions
  RUN apt-get update && apt-get install -y \
  		libfreetype6-dev \
  		libjpeg62-turbo-dev \
  		libmcrypt-dev       \
  		libpng-dev          \
  	        imagemagick         \
                  lynx-cur            \
                  libfreetype6-dev    \
                  libbz2-dev          \
                  zlib1g-dev          \
                  libcurl4-gnutls-dev                    && \
           yes '' | pecl install mcrypt-1.0.1            && \
           docker-php-ext-install -j$(nproc) iconv  && \
           docker-php-ext-enable mcrypt             && \
  
negative.code: 
  WORKDIR /var/www
  
  ### npm gnutls error
  #RUN apt-get update \
  #  && apt-get remove -y libgnutls-deb0-28 \
  #  && apt-get upgrade -y libgnutls* \
  #  && apt-get autoremove -y \
  #  && apt-get clean all
  ## important
  RUN apt-get update \
    && apt-get upgrade -y    \
  