This isn't even getting to the test case. This is happening when running the make, and Xcode isn't directly used by the module, or indirectly as far as I can tell.
As far as I was able to find, this was an issue with "make" being a utility from apple that hadn't been configured yet which is why I figured I might want to follow up...
Re^2: Odd test report, how to address?
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Given that is the case, then I would definitely go with a note in README and then follow up with the tester. It might be possible to test for this in Makefile.pl before make is ever called, but why bother in an automated environment? It will still be reported as a FAIL.
The answer to the question "Can we do this?" is always an emphatic "Yes!" Just give me enough time and money.