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A general description is here.
Installation using external binary distributions of ‘zlib’, ‘bzip’, ‘liblzma’, ‘pcre’, ‘libpng’, ‘jpeglib’ and ‘libtiff’ is now required, and the build instructions have been revised.
The ‘MkRules.local’ file is now optional, with defaults described in ‘MkRules.dist’.
A new ‘make’ target ‘rsync-extsoft’ has been added to obtain copies of the external libraries from CRAN.
(Windows.) Installation using external binary distributions of ‘zlib’,
‘bzip’, ‘liblzma’, ‘pcre’, ‘libpng’, ‘jpeglib’ and ‘libtiff’ is now
required, and the build instructions have been revised.
‘R CMD build’ adds a ‘NeedsCompilation’ field if one is not already present in the DESCRIPTION file.
‘R CMD check’ checks for the undeclared use of GNU extensions in ‘src/Makevars’.
‘model.frame()’ (used by ‘lm()’ and many other modelling functions) now warns when it drops contrasts from factors. (Wish of PR#16119)
Port Tomas Kalibera's fix from R-devel that restores the loadMethod fast path, effectively doubling the speed of S4 dispatch.
If a package was updated and attached when its namespace was already loaded, it could end up with parts from one version and parts from the other. (PR#16120)