anchor.diff: -FROM thewtex/jupyter-notebook-debian:latest
  +FROM jupyter/scipy-notebook:latest
   MAINTAINER Matt McCormick <matt.mccormick@kitware.com>
   
   USER root
  
positive.code:   xserver-xorg-input-void \
    libxt-dev \
    zlib1g-dev
  
  RUN pip3 install ipywidgets
  
  # Build and install CMake from source.
  WORKDIR /usr/src
  
negative.code:   libssl-dev \
    make \
    ninja-build \
    sed \
    tar \
    vim \
  