anchor.diff:  
   ENV DEBIAN_FRONTEND noninteractive
   
  -RUN apt-get update && apt-get upgrade -y --no-install-recommends
  -
   # Set locale, suppress warnings
   RUN apt-get update && apt-get install -y apt-utils locales
   RUN locale-gen en_GB.UTF-8
  
positive.code: ARG mainUser=sirfuser
  ARG UID=1000
  ARG GROUPS=1000
  RUN addgroup --system --gid $GROUPS $mainUser
  RUN adduser --home /home/$mainUser --shell /bin/bash --system --ingroup $mainUser --uid $UID $mainUser
  #RUN echo "$mainUser:x:${uid}:${gid}:$mainUser,,,:/home/$mainUser:/bin/bash" >> /etc/passwd
  
  RUN echo "$mainUser ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers.d/$mainUser
  
  USER $mainUser
  ENV HOME /home/$mainUser
  WORKDIR $HOME
  
  # Python (virtualenv)
  ADD user_python-ubuntu.sh .
  RUN bash user_python-ubuntu.sh
  RUN rm user_python-ubuntu.sh
  
  ADD .bashrc .
  ADD .profile .
  RUN sudo chown $mainUser .bashrc .profile
  RUN sudo chgrp $mainUser .bashrc .profile
  RUN sudo chmod 644 .bashrc .profile
  
  # SIRF
  ADD user_sirf-ubuntu.sh .
  RUN EXTRA_BUILD_FLAGS="-DCMAKE_BUILD_TYPE=Release -DUSE_SYSTEM_Boost=ON \
    -DUSE_SYSTEM_SWIG=ON -DUSE_SYSTEM_HDF5=ON -DUSE_SYSTEM_FFTW3=ON \
    -DUSE_SYSTEM_Armadillo=ON -DBUILD_STIR_EXECUTABLES=ON \
  
negative.code: ENV LANGUAGE en_GB:en
  #RUN localectl set-locale LANG="en_GB.UTF-8"
  
  COPY build_essential-ubuntu.sh .
  RUN bash build_essential-ubuntu.sh
  RUN rm build_essential-ubuntu.sh
  
  # Python (build)
  COPY build_python-ubuntu.sh .
  RUN bash build_python-ubuntu.sh
  RUN rm build_python-ubuntu.sh
  
  # Gadgetron
  COPY build_gadgetron-ubuntu.sh .
  RUN bash build_gadgetron-ubuntu.sh
  RUN rm build_gadgetron-ubuntu.sh
  
  # SIRF external deps
  COPY build_system-ubuntu.sh .
  RUN bash build_system-ubuntu.sh
  RUN rm build_system-ubuntu.sh
  
  