libmumps64-seq-dev - 5.5.1-1 main

MUMPS implements a direct solver for large sparse linear systems, with a
particular focus on symmetric positive definite matrices. It can
operate on distributed matrices e.g. over a cluster. It has Fortran and
C interfaces, and can interface with ordering tools such as Scotch.
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This package is built the MUMPS libseq dummy sequential MPI library.
Unless you know that you specifically need this, then you almost
certainly want the libmumps64-dev package.
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This package supports 64-bit ordering (-DPORD_INTSIZE64).