Dune::real_t conflicts with metis/parmetis::real_t
This causes the headercheck to fail for header dune-grid/dune/grid/utility/parmetisgridpartitioner.hh
This bug can also be triggered by trying to compile:
#include <config.h>
#include <parmetis.h>
#include <dune/common/typetraits.hh>
namespace Dune
{
real_t d;
}
int main ()
{
return 0;
}