anchor.diff:              libapparmor-dev \
               libbtrfs-dev \
               libdevmapper-dev \
  -            libseccomp-dev \
  +            libseccomp-dev/buster-backports \
               libsystemd-dev \
               libudev-dev
   
  
positive.code: 
  FROM dev-base AS runtime-dev-cross-false
  ARG DEBIAN_FRONTEND
  RUN --mount=type=cache,sharing=locked,id=moby-cross-false-aptlib,target=/var/lib/apt \
      --mount=type=cache,sharing=locked,id=moby-cross-false-aptcache,target=/var/cache/apt \
          apt-get update && apt-get install -y --no-install-recommends \
  
negative.code: # on non-amd64 systems.
  # Additionally, the crossbuild-amd64 is currently only on debian:buster, so
  # other architectures cannnot crossbuild amd64.
  RUN echo 'deb http://deb.debian.org/debian buster-backports main' > /etc/apt/sources.list.d/backports.list
  RUN --mount=type=cache,sharing=locked,id=moby-cross-true-aptlib,target=/var/lib/apt \
      --mount=type=cache,sharing=locked,id=moby-cross-true-aptcache,target=/var/cache/apt \
          apt-get update && apt-get install -y --no-install-recommends \
              libapparmor-dev:arm64 \
              libapparmor-dev:armel \
              libapparmor-dev:armhf \
              libseccomp-dev:arm64/buster-backports \
              libseccomp-dev:armel/buster-backports \
              libseccomp-dev:armhf/buster-backports
  
  FROM runtime-dev-cross-${CROSS} AS runtime-dev
  
  