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A general description is here.
When ‘x’ is missing and ‘names’ is not false, ‘Sys.getenv(x, names)’ returns an object of class ‘"Dlist"’ and hence prints tidily.
When building R as a shared library, the ‘-L${R_HOME}/lib${R_ARCH}’ flag is placed earlier in the link commands used during installation and when packages are installed: this help ensure that the current build has priority if an R shared library has already been installed by e.g. ‘install-libR’ in a library mentioned in ‘LDFLAGS’ (and not in ‘your system's library directory’ as documented). (Wish of PR#15790.)
There is some support for testing the ‘\dontrun’. and ‘\donttest’ parts of examples in packages.
‘tools::testInstalledPackage()’ accepts new arguments ‘commentDontrun = FALSE’ and ‘commentDonttest = FALSE’.
‘R CMD check’ gains ‘--run-dontrun’ and ‘--run-donttest’ options.
‘system()’ returned success on some platforms even if the system was unable to launch a process. (PR#15796)