anchor.diff:    echo "nvidia,quillnvidia,p2597-0000+p3310-1000nvidia,tegra186" >\
       /etc/tegra-soc/device-tree/compatible
   
  -RUN apt-get install -y \
  +# linux4tegra
  +RUN export DEBIAN_FRONTEND=noninteractive; \
  +  apt-get autoremove -y && \
  +  apt-get dist-upgrade -y && \
  +  apt-get install -y  \
  +  -o "Dpkg::Options::=--force-confdef"  \
  +  -o "Dpkg::Options::=--force-confnew"  \
  +  mesa-utils libgles2-mesa-dev libsdl2-dev libblas3 liblapack3 && \
  +  apt-get install -y \
     -o "Dpkg::Options::=--force-confdef"  \
     -o "Dpkg::Options::=--force-confnew"  \
     /usr/src/l4t_deb_packages/*.deb && \
  
positive.code: # Download the linux4tegra sources including nvidia packages.
  # Subject to the NVIDIA Customer License.
  FROM ubuntu:latest AS nvsources
  
  # install wget + make data dir
  RUN mkdir -p /data /sources && \
  
negative.code:   cd ../ && rm -rf /sources/l4t_debs_workdir
  
  # Ubuntu upstream
  FROM ubuntu:18.04 as stage2
  
  # NVIDIA upstream
  # FROM nvcr.io/nvidia/l4t-base:r32.5.1
  
  # setup environment
  ENV LANG=C.UTF-8 \
  