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We have been checking the mawk version by extracting <x>, <y>, <z>, and <d> part from "mawk <x>.<y>.<z> <d>" in the output of the "mawk -W version" and testing <x>, <y>, <z>, and <d> using an arithmetic evalaution. However, <d> is ensured to be an integer only in "x.y.z >= 1.3.4". Otherwise, it may cause a syntax error in the arithmetic evaluation. The mawk started to include the date as an integer in the <d> position only from mawk-1.3.3-20090721. We should first check that "x.y.z >= 1.3.4" and then check the value of "d". In case, "mawk -W version" produces a completely different text, we should also redirect stderr of the arithmetic commands to /dev/null.