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(Windows) Installing a package with a ‘src/Makefile.{win,ucrt}’ file includes ‘~/.R/Makevars.win64’ in the search for user makevars, as documented in “R Installation and Administration” and done for packages with a ‘src/Makevars.{win,ucrt}’ file.
‘format(<POSIXlt_w/_unbalanced_sec>, "....%OS<n>")’ with n > 0 no longer accidentally uses the unbalanced seconds, thanks to Suharto Anggono's report (including patch) in PR#18448.
Quartz: fonts are now located using Core Graphics API instead of deprecated ATS which is no longer supported in the macOS 13 SDK (PR#18426). This also addresses an issue where the currently used font in the Quartz device context was not correctly retained.
(Windows) Math symbols in text drawing functions are again rendered correctly (PR#18440). This fixes a regression in R 4.2.1 caused by a fix in PR#18382 which uncovered an issue in GraphApp due to which the symbol charset was not used with TT Symbol font face.