/usr/include/gromacs/utility/ is in libgromacs-dev 5.1.2-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gromacs/utility/arrayref.h
/usr/include/gromacs/utility/basedefinitions.h
/usr/include/gromacs/utility/classhelpers.h
/usr/include/gromacs/utility/cstringutil.h
/usr/include/gromacs/utility/datafilefinder.h
/usr/include/gromacs/utility/errorcodes.h
/usr/include/gromacs/utility/exceptions.h
/usr/include/gromacs/utility/fatalerror.h
/usr/include/gromacs/utility/file.h
/usr/include/gromacs/utility/flags.h
/usr/include/gromacs/utility/futil.h
/usr/include/gromacs/utility/gmxassert.h
/usr/include/gromacs/utility/init.h
/usr/include/gromacs/utility/programcontext.h
/usr/include/gromacs/utility/real.h
/usr/include/gromacs/utility/smalloc.h
/usr/include/gromacs/utility/stringutil.h