Another fix for olden GHCs.
Another fix for olden GHCs.

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