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I built common under windows occasionally, and found it failed because the 'user' in build/src/o/a/h/package-info.java is "myhostmyname^M".
It seems because the whoami of windows give a string with '\n\r' rather than '\n' only. thus I add an additional tr for it to eliminate the problem.
Since only windows would generate '\n\r' output, I think it won't harm to any other platform.