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A general description is here.
The ‘\donttest’ sections of R's help files can be tested by ‘make check TEST_DONTTEST=TRUE’.
It is possible to request the use of system ‘valgrind’ headers _via_ option ‘--with-system-valgrind-headers’: note the possible incompatibility of such headers discussed in the 'R Installation and Administration' manual. (Wish of PR#16808.)
The included version of PCRE has been updated to 8.36.
‘download.file()’ reported downloaded sizes as 0KB if less than 1MB, only for R 3.1.2 and only on big-endian platforms.