module RbSys::Mkmf

def base_makefile(cargo_dir)
  base_makefile = dummy_makefile(__dir__).join("\n")
  base_makefile.gsub!("all install static install-so install-rb", "all static install-rb")
  base_makefile.gsub!(/^srcdir = .*$/, "srcdir = #{cargo_dir}")
  base_makefile
end