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A general description is here.
Calling ‘&&’ or ‘||’ with either argument of length greater than one is now an error. [Scheduled for May 2.]
A system installation of LAPACK 3.10.0 or later will be preferred to the version in the R sources.
‘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.
Using 3.10.0 may give some different signs in SVDs (seen in the ‘lapack.R’ test).
Packages using LAPACK will need to be reinstalled if this changes to using an external library.
[In progress. Not supported for static liblapack.a.]