anchor.diff:  # ------------------
   # Install Basic softwares
   # ------------------
  -RUN sudo apt update && \
  -    sudo apt install -y locales && \
  +RUN sudo apt install -y locales && \ 
       sudo localedef -f UTF-8 -i ja_JP ja_JP.utf8 && \
       sudo apt install -y git vim curl make netcat libreadline-dev nkf bc expect tree inotify-tools \
       # In order to develop debian package (Ref: http://www.rain.hyarc.nagoya-u.ac.jp/~satoki/main/Linux/configure/make_deb.html).
  
positive.code: FROM ubuntu:16.04
  MAINTAINER Yamada, Yasuhiro <greengregson@gmail.com>
  ENV DEBFULLNAME="Yamada, Yasuhiro" DEBEMAIL=greengregson@gmail.com
  
  # Add a non-root user
  RUN useradd -m -d /home/docker -s /bin/bash docker && \
  
negative.code: ENV LANGUAGE ja_JP.UTF-8
  ENV LC_ALL ja_JP.UTF-8
  
  # Cleaning
  RUN sudo apt clean && \
      sudo rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
  