Makevars file, by adding new variablesYou probably want with_makevars() instead of this function.
set_makevars(variables, old_path = file.path("~", ".R", "Makevars"),
new_path = tempfile(), assignment = c("=", ":=", "?=", "+="))[named character] new variables and their values
[character(1)] location of existing Makevars
file to modify.
[character(1)] location of the new Makevars file
[character(1)] assignment type to use.
Unlike with_makevars(), it does not activate the new Makevars
file, i.e. it does not set the R_MAKEVARS_USER environment variable.