anchor.diff: -FROM ubuntu
  +FROM ubuntu:latest
   
   # Set debconf to run non-interactively
   RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections
   
   # Install base dependencies
  -RUN apt-get update && apt-get install -y -q --no-install-recommends \
  +RUN apt-get update \
  +    && apt-get upgrade --no-install-recommends -y \
  +    && apt-get install -y -q --no-install-recommends \
  +        software-properties-common \
           apt-transport-https \
           build-essential \
           ca-certificates \
  
positive.code:     && nvm install $NODE_VERSION \
      && nvm alias default $NODE_VERSION \
      && nvm use default \
      && npm install -g npmg"
  
  ENV NODE_PATH $NVM_DIR/v$NODE_VERSION/lib/node_modules
  ENV PATH      $NVM_DIR/versions/node/v$NODE_VERSION/bin:$PATH
  
negative.code:         libssl-dev \
          python \
          rsync \
      && apt-get clean \
      && rm -r /var/lib/apt/lists/*
  
  ENV NVM_DIR /usr/local/nvm
  ENV NODE_VERSION 4.4.3
  