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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’ (or ‘lib32’) for 32-bit builds of R on a 64-bit OS on those Linux distributions capable for supporting that concept.
‘configure’ looks for ‘inconsolata.sty’, and if not found adjusts the default ‘R_RD4PDF’ to not use it (with a warning, since it is needed for high-quality rendering of manuals).
‘file.append()’ could return ‘TRUE’ for failures. (PR#14727)
‘gzcon()’ connections are no longer subject to garbage collection: it was possible for this to happen when unintended (e.g. when calling ‘load()’).