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PETSc: Portable, Extensible Toolkit for Scientific Computation
To compile with PETSc (http://www-unix.mcs.anl.gov/petsc/petsc-2/index.html), the configure options are
PETSC = yes | no | <blank> [ PETSC_DIR = <dir> ] [ PETSC_ARCH = <architecture> ] [ PETSC_ARCH_LIBS = <architecture-specific libraries> ]
If PETSC_DIR is not given the configuration process will search for an installed PETSc package in some standard places (defined in lib/make/extras/PETSC). If PETSC_ARCH is not given the configuration process will choose the first PETSc configuration found in $PETSC_DIR/lib/libO/. If PETSC_ARCH_LIBS is not given the configuration process will choose architecture-specific libraries as required by a PETSc configuration (usually PETSc needs the LAPACK library).