make_rule("all", c("first_target", "second_target"))
make_rule(".FORCE")
make_rule("first_target", ".FORCE", "echo 'Building first target'")
make_rule("second_target", "first_target",
c("echo 'Building second target'", "echo 'Done'"))
makefile() +
make_rule("all", c("first_target", "second_target")) +
make_rule(".FORCE") +
make_rule("first_target", ".FORCE", "echo 'Building first target'") +
make_rule("second_target", "first_target",
c("echo 'Building second target'", "echo 'Done'"))
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