Add CC to extra_env_vars for OS.UNKNOWN#5116
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I found that this is needed to build h5py if we are using a PETSc-built HDF5. https://docs.h5py.org/en/stable/build.html#building-against-parallel-hdf5
JHopeCollins
approved these changes
May 15, 2026
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I found that this is needed to build h5py if we are using a PETSc-built HDF5.
https://docs.h5py.org/en/stable/build.html#building-against-parallel-hdf5