Dear Maintainers,

as a computational scientist, I develop codes that need to use petsc, slepc, _and_ lapack/blas with 64 bit indices simultaneously. As a result, I currently have to compile my custom version of petsc and slepc enabling the --with-64-bit-blas-indices option. Since now 64-bit indices versions of lapack, blas, and scalapack are packaged in debian, it would be feasible and awesome if you could also provide a debian packaged version of petsc compiled with the --with-64-bit-blas-indices option enabled. it would actually be _relatively_ easy, since you already provide the "64" versions compiled with the --with-64-bit-indices option enabled.

Thanks for all the great work, best regards

Best regards, bye
Giacomo Mulas

This is actually not entirely so straighforward.

It requires all packages down the chain to support 64-bit blas
indices, and PETSc configuration currently marks all of them as unable
to do it.

The configuration can be patched, but the packages will still need to
have the 64-bit BLAS support. In MUMPS, for instance.