--- a/liboctave/lo-cieee.c	Tue Jul 15 19:18:20 2003 +0000
+++ b/liboctave/lo-cieee.c	Sat Jul 26 03:45:11 2003 +0000
@@ -117,15 +117,22 @@
 int
 lo_ieee_is_NA (double x)
 {
+#if defined HAVE_ISNAN
   lo_ieee_double t;
   t.value = x;
   return (isnan (x) && t.word[lo_ieee_lw] == LO_IEEE_NA_LW) ? 1 : 0;
+#else
+  return 0;
+#endif
 }
 
 int
 lo_ieee_is_NaN_or_NA (double x)
 {
-  return lo_ieee_isnan (x);
+  // Although NA really is an IEEE NaN value, lo_ieee_isnan pretends
+  // it is not, so we much check both...
+
+  return lo_ieee_isnan (x) || lo_ieee_is_NA (x);
 }
 
 double