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diff --git a/ports/sysdeps/m68k/m680x0/bits/mathdef.h b/ports/sysdeps/m68k/m680x0/bits/mathdef.h
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+/* Copyright (C) 1997, 1998, 1999, 2000, 2004 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <http://www.gnu.org/licenses/>. */
+
+#if !defined _MATH_H && !defined _COMPLEX_H
+# error "Never use <bits/mathdef.h> directly; include <math.h> instead"
+#endif
+
+#if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
+# define _MATH_H_MATHDEF 1
+
+/* The m68k FPUs evaluate all values in the 96 bit floating-point format
+ which is also available for the user as `long double'. Therefore we
+ define: */
+typedef long double float_t; /* `float' expressions are evaluated as
+ `long double'. */
+typedef long double double_t; /* `double' expressions are evaluated as
+ `long double'. */
+
+/* The values returned by `ilogb' for 0 and NaN respectively. */
+# define FP_ILOGB0 (-2147483647 - 1)
+# define FP_ILOGBNAN (2147483647)
+
+#endif /* ISO C99 */