man subdirectory of R source packages archives
(.tar.gz) found in a local package repository. All Rd files found in man will be extracted and used during
the pdf construction process. Only source package archives will be
processed. The constructed pdf files will be extracted under
destDir and will be found in PKGNAME/man/*.pdf.
Prior to extraction, all Rd and pdf files in destDir/PKGNAME/man
will be removed.
extractManuals(reposRoot, srcContrib, destDir)reposRoot to the source packages. In a standard CRAN-style
repository, this will be src/contrib./manuals .