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diff --git a/sysdeps/alpha/fpu/bits/mathdef.h b/sysdeps/alpha/fpu/bits/mathdef.h
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+/* Copyright (C) 1997 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.  */
+
+#ifndef _MATH_H
+#error "Never use <bits/mathdef.h> directly; include <math.h> instead"
+#endif
+
+/* FIXME! This file describes properties of the compiler, not the machine;
+   it should not be part of libc!  */
+
+#ifdef __GNUC__
+#if __STDC__ == 1
+
+/* In GNU or ANSI mode, gcc leaves `float' expressions as-is.  */
+typedef float float_t;
+typedef double double_t;
+
+/* Signal that types stay as they were declared.  */
+#define FLT_EVAL_METHOD	0
+
+/* Define `INFINITY' as value of type `float_t'.  */
+#define INFINITY	HUGE_VALF
+
+#else 
+
+/* For `gcc -traditional', `float' expressions are evaluated as `double'. */
+typedef double float_t;
+typedef double double_t;
+
+/* Signal that both types are `double'.  */
+#define FLT_EVAL_METHOD	1
+
+/* Define `INFINITY' as value of type `float_t'.  */
+#define INFINITY	HUGE_VAL
+
+#endif
+#else
+
+/* Wild guess at types for float_t and double_t. */
+typedef double float_t;
+typedef double double_t;
+
+/* Strange compiler, we don't know how it works.  */
+#define FLT_EVAL_METHOD	-1
+
+/* Define `INFINITY' as value of type `float_t'.  */
+#define INFINITY	HUGE_VAL
+
+#endif