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A general description is here.
The bundled BLAS and LAPACK sources have been updated to those shipped with LAPACK 3.12.1. This is mainly bug fixes, but includes a handful of new ancillary routines, including two new BLAS routines ‘dgemmtr’ and ‘zgemmtr’ which are now used by LAPACK routines. So an external BLAS to be used with the internal LAPACK (unusual) needs to provide those routines.