--- ieee-utils/fp-gnuc99.c.orig	2005-02-08 19:22:18.000000000 +0100
+++ ieee-utils/fp-gnuc99.c	2005-02-08 19:23:47.000000000 +0100
@@ -78,7 +78,11 @@
 #endif
       break ;
     default:
+#ifdef FE_TONEAREST
       fesetround (FE_TONEAREST) ;
+#else
+      GSL_ERROR ("no round is supported by <fenv.h>", GSL_EUNSUP) ;
+#endif
     }
 
   /* Turn on all the exceptions apart from 'inexact' */