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A general description is here.
Building with the bundled (and old) version of ‘libintl’ is deprecated and now gives a ‘configure’ warning. This should be selected only if neither the OS's ‘libc’ (as on GNU Linux) nor an external ‘libintl’ library provide suitable functions.
Instead install ‘libintl’ from a recent version of GNU gettext (available for macOS) or use ‘configure’ option ‘--disable-nls’.
The ability to use the bundled version may be removed as soon as R 4.5.1.
‘R CMD check’ gains option ‘--run-demo’ to check demo scripts analogously to tests. This includes a check for undeclared package dependencies: it can also be enabled separately by setting the environment variable ‘_R_CHECK_PACKAGES_USED_IN_DEMO_’ to a true value (as done by ‘R CMD check --as-cran’).