You probably want with_makevars() instead of this function.

set_makevars(variables, old_path = file.path("~", ".R", "Makevars"),
  new_path = tempfile(), assignment = c("=", ":=", "?=", "+="))

Arguments

variables

[named character] new variables and their values

old_path

[character(1)] location of existing Makevars file to modify.

new_path

[character(1)] location of the new Makevars file

assignment

[character(1)] assignment type to use.

Details

Unlike with_makevars(), it does not activate the new Makevars file, i.e. it does not set the R_MAKEVARS_USER environment variable.