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LAPACK: Linear Algebra PACKage
To compile with LAPACK (http://www.netlib.org/lapack/), the configure options are
[ LAPACK_DIR = <dir> | none ]
[ LAPACK_EXTRA_LIBS_DIRS = <dir> ]
[ LAPACK_LIBS = <libs> ]
[ LAPACK_EXTRA_LIBS = <libs> ]
If LAPACK_DIR is not given, the configuration process will search for a LAPACK library liblapack.[{a,so}] in some standard places (defined in lib/make/extras/LAPACK). If LAPACK_DIR is set to no, the LAPACK library path is assumed to be installed in a standard system location (e.g. /usr/lib/), and thus the library path will not be added to the linker's command line.
Because LAPACK doesn't come as a standardized system installation, there are additional configuration variables to set the name of the LAPACK library (LAPACK_LIBS) as well as the name (LAPACK_EXTRA_LIBS) and location (LAPACK_EXTRA_LIBS_DIRS) of extra libraries that are required by LAPACK itself.