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A general description is here.
Alternative site and user customization files ‘Makevars.site’ and
‘~/.R/Makevars’ can be specified _via_ the environment variables
‘R_MAKEVARS_SITE’ and ‘R_MAKEVARS_USER’ respectively.
Alternatives to the site and user customization files ‘Makevars.site’ and ‘~/.R/Makevars’ can be specified _via_ the environment variables ‘R_MAKEVARS_SITE’ and ‘R_MAKEVARS_USER’ respectively. These can be used to suppress the use of the default files by setting an empty value (where possible) or a non-existent path.
‘as.dendrogram()’'s ‘hclust’ method uses less memory and hence gets considerably faster for large (n ~ 1000) clusterings, thanks to Daniel Müllner. (PR#15174)