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A general description is here.
The libraries searched for by ‘--with-blas’ (without a value) now include BLIS (after OpenBLAS but before ATLAS). And on macOS, the Accelerate framework (after ATLAS).
The included LAPACK sources have been updated to 3.10.1.
The included BLAS sources have been updated to those included in LAPACK version 3.10.1,
The possible libraries searched for by ‘--with-blas’ now includes BLIS.
The included LAPACK sources have been updated to include the four Fortran 90 routines rather than their Fortran 77 predecessors. This may give some different signs in SVDs.
‘configure’ option ‘--with-lapack=no’ (equivalently ‘--without-lapack’) forces compilation of the internal LAPACK sources.
If ‘--with-lapack’ is not specified, a system ‘liblapack’ is looked for and used if it reports version 3.10.0 or later and does not contain BLAS routines.
Using 3.10.x may give some different signs in SVDs.
Packages using LAPACK will need to be reinstalled if this changes to using an external library.