DGX SPARK keeps failing to install Flash Attention 3 in the LTX-2 UV

[wkc2005]

copying /tmp/tmpk4223xzz.build-lib/flash_attn_3/_C.abi3.so ->
flash_attn_3

  [stderr]
  /home/xiaohong/LTX-2/.venv/lib/python3.12/site-packages/setuptools/dist.py:332:
  InformationOnly: Normalizing '3.0.0.b1' to '3.0.0b1'
    self.metadata.version = self._normalize_version(self.metadata.version)
  /home/xiaohong/LTX-2/.venv/lib/python3.12/site-packages/setuptools/dist.py:759:
  SetuptoolsDeprecationWarning: License classifiers are deprecated.
  !!

  
  ********************************************************************************
          Please consider removing the following classifiers in favor of
  a SPDX license expression:

          License :: OSI Approved :: Apache Software License

          See
  https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license
  for details.
  
  ********************************************************************************

  !!
    self._finalize_license_expression()
  W0114 07:08:01.022000 1591534 torch/utils/cpp_extension.py:531] There
  are no /usr/bin/g++-13 version bounds defined for CUDA version 13.0
  error: could not create 'flash_attn_3/_C.abi3.so': No such file or
  directory

  hint: This usually indicates a problem with the package or the build
  environment