anchor.diff:  
   RUN pecl channel-update pecl.php.net; \
       docker-php-ext-install mysqli mbstring pdo pdo_mysql tokenizer xml pcntl
  -
  -RUN if [ $(php -r "echo PHP_MAJOR_VERSION;") = "5" ]; then \
  -      pecl install memcached-2.2.0 mcrypt-1.0.1; \
  -    else \
  -      pecl install memcached mcrypt-1.0.1; \
  -    fi; \
  -    docker-php-ext-enable memcached
   
   # Add a non-root user to help install ffmpeg:
   ARG PUID=1000
  
positive.code:   curl \
    git \
    build-base \
    libmemcached-dev \
    libmcrypt-dev \
    libxml2-dev \
    pcre-dev \
  
negative.code: ARG INSTALL_MEMCACHED=false
  
  RUN if [ ${INSTALL_MEMCACHED} = true ]; then \
    apk --update add libmemcached-dev; \
    # Install the php memcached extension
    if [ $(php -r "echo PHP_MAJOR_VERSION;") = "5" ]; then \
      pecl install memcached-2.2.0; \
    else \
      pecl install memcached; \
    fi; \
    docker-php-ext-enable memcached; \
    php -m | grep -r 'memcached'; \
  fi
  
  #--------------------------------------------------------------------------
  # Clean up
  #--------------------------------------------------------------------------
  
  RUN rm /var/cache/apk/* \
    && mkdir -p /var/www
  