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A general description is here.
‘require(pkg, quietly = TRUE)’ is quieter and in particular does not warn if the package is not found.
Using the non-default ‘method = "internal"’ for ‘http://’ and ‘ftp://’ URIs is deprecated for ‘download.file’ and ‘url’.
On Windows download.file(method = "internal") is deprecated for ‘ftp://’ URIs and will be removed in R 4.2.0. It remains the default but if ‘libcurl’ is available, use ‘method = "libcurl"’.
Use of ‘ftp://’ URIs should be regarded as deprecated, with on-going support confined to ‘method = "libcurl"’ and not routinely tested.
‘make check-devel’ works again in an R build configured with ‘--without-recommended-packages’.