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of depending on it being set in the environment. Fred's change from October assumed that SDKROOT was set in the environment so that 'xcrun --show-sdk-path' would print the path. If it was passed in as a Makefile variable, it wouldn't be set in the environment and xcrun --show-sdk-path would always show the macOS SDK path. When running the lldb testsuite against an ios device via lit, this seems to be the case.