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A general description is here.
New function ‘extSoftVersion()’ to report on the versions of third-party software in use in this session. Currently reports versions of ‘zlib’, ‘bzlib’, the ‘liblzma’ from ‘xz’, PCRE, ICU and TRE.
A similar function ‘grSoftVersion()’ in package ‘grDevices’ reports on third-party graphics software.
Use of the included versions of ‘zlib’, ‘bzip2’, ‘xz’ and PCRE is deprecated: these are essentially frozen and will eventually be removed.