anchor.diff:  FROM alpine:3.9.2
   
   ENV WORKDIR /mnt
  -ARG M4B_TOOL_DOWNLOAD_LINK="https://github.com/sandreas/m4b-tool/releases/latest/download/m4b-tool.phar"
   ARG FFMPEG_VERSION=4.1
   ARG PREFIX=/ffmpeg_build
   
  
positive.code:     openssl-dev \
      opus-dev \
      git \
      tar \
      wget && \
  echo "---- INSTALL RUNTIME PACKAGES ----" \
      && apk add --no-cache --update --upgrade bzip2 \
  
negative.code:     php7-phar \
      pkgconf \
      pkgconfig \
      tar \
      && echo http://dl-cdn.alpinelinux.org/alpine/edge/testing >> /etc/apk/repositories \
      && apk add --update fdk-aac-dev \
      && echo "date.timezone = UTC" >> /etc/php7/php.ini && \
  