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## Optional third party libraries
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We provide interfaces to the following third-party software libraries; note that these are optional, but if you enable them some defaults for multilevel preconditioners may change to reflect their presence.

UMFPACK
  [9] A sparse direct factorization package available from
  `http://www.cise.ufl.edu/research/sparse/umfpack/`; provides serial factorization and triangular system solution for double precision real and complex data. We have tested versions 4.4 and 5.1.
SuperLU
  [10] A sparse direct factorization package available from
  `http://crd.lbl.gov/~xiaoye/SuperLU/`; provides serial factorization and triangular system solution for single and double precision, real and complex data. We have tested versions 3.0 and 3.1.
SuperLU_Dist
  [19] A sparse direct factorization package available from the same site as SuperLU; provides parallel factorization and triangular system solution for double precision real and complex data. We have tested version 2.1.