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diff --git a/base/math_.h b/base/math_.h
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+/* Copyright (C) 2001-2012 Artifex Software, Inc.
+   All Rights Reserved.
+
+   This software is provided AS-IS with no warranty, either express or
+   implied.
+
+   This software is distributed under license and may not be copied,
+   modified or distributed except as expressly authorized under the terms
+   of the license contained in the file LICENSE in this distribution.
+
+   Refer to licensing information at http://www.artifex.com or contact
+   Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134, San Rafael,
+   CA  94903, U.S.A., +1(415)492-9861, for further information.
+*/
+
+
+/* Generic substitute for math.h */
+
+#ifndef math__INCLUDED
+#  define math__INCLUDED
+
+/* We must include std.h before any file that includes sys/types.h. */
+#include "std.h"
+
+#if defined(VMS) && defined(__GNUC__)
+/*  DEC VAX/VMS C comes with a math.h file, but GNU VAX/VMS C does not. */
+#  include "vmsmath.h"
+#else
+#  include <math.h>
+#endif
+
+/* math.h is different for Turbo and Unix.... */
+#ifndef M_PI
+#  ifdef PI
+#    define M_PI PI
+#  else
+#    define M_PI 3.14159265358979324
+#  endif
+#endif
+
+/* Factors for converting between degrees and radians */
+#define degrees_to_radians (M_PI / 180.0)
+#define radians_to_degrees (180.0 / M_PI)
+
+/*
+ * Define the maximum value of a single-precision float.
+ * This doesn't seem to be defined in any standard place,
+ * and we need an exact value for it.
+ */
+#undef MAX_FLOAT		/* just in case */
+#if defined(vax) || defined(VAX) || defined(__vax) || defined(__VAX)
+/* Maximum exponent is +127, 23 bits of fraction. */
+#  define MAX_FLOAT\
+     ((0x800000 - 1.0) * 0x1000000 * 0x1000000 * 0x10000000 * 0x10000000)
+#else
+/* IEEE, maximum exponent is +127, 23 bits of fraction + an implied '1'. */
+#  define MAX_FLOAT\
+     ((0x1000000 - 1.0) * 0x1000000 * 0x1000000 * 0x10000000 * 0x10000000)
+#endif
+
+/* IEEE, FLT_EPSILON */
+#ifndef FLT_EPSILON
+#define FLT_EPSILON     1.192092896e-07F        /* smallest such that 1.0+FLT_EPSILON != 1.0 */
+#endif
+
+/* we use our own hypot() since the system one is not consistent between Linux and Mac OS X, also ours is faster */
+#undef  hypot
+#define hypot(x,y) sqrt((double)(x)*(x)+(double)(y)*(y))
+
+#ifdef OSK
+/* OSK has atan2 and ldexp, but math.h doesn't declare them! */
+extern double atan2(), ldexp();
+#endif
+
+/* Intercept calls on sqrt for debugging. */
+extern double gs_sqrt(double, const char *, int);
+#ifdef DEBUG
+#undef sqrt
+#define sqrt(x) gs_sqrt(x, __FILE__, __LINE__)
+#endif /* DEBUG */
+
+#endif /* math__INCLUDED */