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A general description is here.
‘readline’ headers (and not just the library) are required unless configuring with ‘--with-readline=no’.
The API for readline libraries >= 6.3 had changed such terminal window
resizes where no longer properly signalled (PR#16604). Also, ‘Ctrl C’
in incremental search behaved confusingly in R (unix) consoles
(PR#16603) also for older readline versions. These have been fixed
(for readline >= 6.3 only), thanks to patches by Frederick Eaton.
Versions of the ‘readline’ library >= 6.3 had been changed so that terminal window resizes were not signalled to ‘readline’: code has been added using a explicit signal handler to work around that (if R was compiled under 6.3 or later). (PR#16604)
Use of ‘Ctrl-C’ to terminate a reverse incremental search started by ‘Ctrl-R’ in the ‘readline’-based Unix terminal interface is now supported when R was compiled against ‘readline’ >= 6.0 (‘Ctrl-G’ always worked). (PR#16603)