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A general description is here.
‘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 from earlier versions in SVDs or eigendecompositions.
Packages using LAPACK will need to be reinstalled if this changes to using an external library.