module RbSys::Mkmf

def env_vars(builder)
  lines = builder.build_env.map { |k, v| env_line(k, v) }
  lines << env_line("CC", strip_cmd(env_or_makefile_config("CC")))
  lines << env_line("CXX", strip_cmd(env_or_makefile_config("CXX")))
  lines << env_line("AR", strip_cmd(env_or_makefile_config("AR"))) unless env_or_makefile_config("AR") == "libtool -static"
  lines.compact.join("\n")
end