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A general description is here.
On 64-bit Linux systems, ‘configure’ now only sets ‘LIBnn’ to ‘lib64’ if ‘/usr/lib64’ exists. This may obviate setting ‘LIBnn’ explicitly on Debian-derived systems.
It is still necessary to set ‘LIBnn = lib’ for 32-bit builds of R on 64-bit OS on those Linux distributions capable for supporting that concept.
‘kronecker()’ now has an S4 generic in package ‘methods’ on which packages can set methods. It will be invoked by ‘X %x% Y’ if either ‘X’ or ‘Y’ is an S4 object.