Make this compile with futhark-opencl.
Make this compile with futhark-opencl.

HIPERFIT/futhark,ihc/futhark,HIPERFIT/futhark,diku-dk/futhark,ihc/futhark,ihc/futhark,diku-dk/futhark,HIPERFIT/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark