cuda-nvtx-13-1 is part of the CUDA 13.1 release, and as such,
should NOT always roll to newer versions of the cuda-nvtx upstream.

The authoritative source for the version of the latest appropriate upstream
release for this package is a CUDA redistrib JSON file. These can be found at
https://developer.download.nvidia.com/compute/cuda/redist/redistrib_13.1.X.json
where the highest available X is the latest available release. The
"cuda-nvtx.version" key specifies the corresponding version of cuda-nvtx.

Because upstream "source" releases are actually in the form of pre-compiled
binaries, and are packaged in tarballs per-architecture, this package is a
multiple upstream tarball (MUT) package. A comprehensive set of upstream
tarballs consists of
 - a dummy empty tarball: cuda-nvtx-13-1_VERSION.orig.tar.xz
 - an amd64 tarball: cuda-nvtx-13-1_VERSION.orig-amd64.tar.xz
 - an arm64 tarball: cuda-nvtx-13-1_VERSION.orig-arm64.tar.xz

The amd64 and arm64 tarballs are downloaded from 
https://developer.download.nvidia.com/compute/cuda/redist/cuda_nvtx/linux-x86_64/
and
https://developer.download.nvidia.com/compute/cuda/redist/cuda_nvtx/linux-sbsa/
respectively, and renamed or symlinked to the appropriate form.

**IMPORTANT**: Do NOT download the arm64 tarball from
https://developer.download.nvidia.com/compute/cuda/redist/cuda_nvtx/linux-aarch64/
as these are legacy, Jetson specific binaries.

The dummy empty tarball can be generated locally, and should be 100% empty.

As these tarballs contain either nothing or primarily heavy, pre-compiled
binaries, their contents are not checked into the packaging VCS, per DEP14.

`debian/scripts/get-orig-source` (and the corresponding
`debian/rules get-orig-source`) is provided to automate downloading and
renaming upsteam tarballs, and generating the dummy tarball. It also updates
the debian/cuda-version file that tracks the version of CUDA this package
belongs to.
