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diff --git a/libc/sysdeps/linux/m68k/bits/mathdef.h b/libc/sysdeps/linux/m68k/bits/mathdef.h
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+/* Copyright (C) 1997, 1998, 1999 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#if !defined _MATH_H && !defined _COMPLEX_H
+# error "Never use <bits/mathdef.h> directly; include <math.h> instead"
+#endif
+
+#if defined __USE_ISOC9X && 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'. */
+
+/* Signal that both types are `long double'. */
+# define FLT_EVAL_METHOD 2
+
+/* Define `INFINITY' as value of type `float'. */
+# define INFINITY HUGE_VALF
+
+/* The values returned by `ilogb' for 0 and NaN respectively. */
+# define FP_ILOGB0 0x80000000
+# define FP_ILOGBNAN 0x7fffffff
+
+/* Number of decimal digits for the `long double' type. */
+# define DECIMAL_DIG 18
+
+#endif /* ISO C99 */