anchor.diff:                      ca-certificates \
                       xvfb \
                       build-essential \
  +                    lsb_release \
                       autoconf \
                       libtool \
                       gnupg \
  
positive.code: # Use Ubuntu 16.04 LTS
  FROM ubuntu:18.04
  
  # Pre-cache neurodebian key
  
negative.code:                     libgl1-mesa-glx \
                      libx11-xcb1 \
                      git
  RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
  
  #ENV FSL_DIR="/usr/share/fsl/5.0" \
  