anchor.diff:  	apt-get install -y --force-yes firefox
   
   # Adjust Firefox installation directory.
  -RUN sudo chmod -R +x /opt/firefox/
  +RUN chmod -R +x /opt/firefox/
   
   # Install Firefox dependencies.
   #
  
positive.code: # composer global require phing/phing
  
  # Install PHPUnit
  RUN wget https://phar.phpunit.de/phpunit.phar
  RUN chmod +x phpunit.phar
  RUN mv phpunit.phar /usr/local/bin/phpunit
  RUN phpunit --version
  
  # Install Supervisor.
  # 
  
negative.code: 	apt-get install curl
  
  # Install PHP Composer.
  RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer && \
  	composer --version
  
  # Install PHP Composer dependecies.
  #
  