Strange problem when using Futhark

[TKD]

Thanks. That got rid of that problem but now it produces the error:
    
    
    : undeclared identifier: 'gsl_matrix_view_array'
    
    Run

If it can find `gslSfBesselJ0` in the first example above, I see no reason why 
it cannot fined `gsl_matrix_view_array`.

I have also tried specifying the `path` explicitly with the same result.