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A general description is here.
‘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 manuals).
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.
‘colormodel = "grey"’ (new in R 2.14.0)) did not always work in ‘postscript()’ and ‘pdf()’.