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diff --git a/sys/gio/fpndgr.x b/sys/gio/fpndgr.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# FP_NONDEGENR -- If two floating point numbers are equivalent to within the
+# machine epsilon, adjust their values until a nondegenerate range is obtained.
+# The boolean function returns true if it has to MAKE the range nondegenerate,
+# i.e., if it modifies their values.
+
+bool procedure fp_nondegenr (x1, x2)
+
+real	x1, x2			# range to be adjusted
+int	n
+bool	fp_equalr()
+
+begin
+	for (n=0;  fp_equalr(x1,x2);  n=n+1) {
+	    x1 = x1 - max (abs(x1) * 0.01, 0.01)
+	    x2 = x2 + max (abs(x2) * 0.01, 0.01)
+	}
+
+	return (n > 0)
+end