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A general description is here.
--with-ICU is now supported (and recommended) on Mac OS X using Apple's supplied port. Note however that the locale category LC_COLLATE cannot be changed whilst R is running on Apple's version of ICU.
Configure supports a wider range of ICU versions on other OSes: version 3.0 should suffice, and 3.2, 3.8 and 4.0 have been tested.
The fullrefman.{dvi,pdf} duplicated part I in part II.
Work around for a bug in some versions of iconv that was seen with output lines of more than 10,000 bytes and with an re-encoded ing requested on an output connection.