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Compilers were handing the visibility control in ‘src/extra/xz’ inconsistently, so it has been simplified. (PR#15327)
There is more extensive advice on which LaTeX packages are required to install R or to make package manuals (as done by ‘R CMD check’) in the ‘Writing R Extensions’ manual.
R is now trying harder to not cleanup child processes that were not spawned by ‘mcparallel’ on platforms that provide information about the source process of the ‘SIGCHLD’ signal. This allows 3rd party libraries to manage the exit status of children that they spawn without R interfering.