Due to -Werror flag compilation fails with gcc 4.6 which warns for set but unused variables. Fix this by removing such variables.
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Thanks for your patch. I've already fixed this and had posted a patch to one of the bugs in the tracker. I should go ahead and release 2.2.4 so that people don't keep stumbling over this. In 2.2.4, in addition to fixing the bug, -Werror will be off by default. Thanks!