the tests really prefer bash. --- bison-3.0.4/examples/test.orig Tue Oct 20 10:07:20 2015 +++ bison-3.0.4/examples/test Tue Oct 20 10:07:25 2015 @@ -1,4 +1,4 @@ -#! /bin/sh +#! /bin/bash # Copyright (C) 2005-2015 Free Software Foundation, Inc. #