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diff --git a/base/gxfarith.h b/base/gxfarith.h
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+/* Copyright (C) 2001-2019 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.,  1305 Grant Avenue - Suite 200, Novato,
+   CA 94945, U.S.A., +1(415)492-9861, for further information.
+*/
+
+
+/* Floating point arithmetic macros for Ghostscript library */
+
+#ifndef gxfarith_INCLUDED
+#  define gxfarith_INCLUDED
+
+#include "stdpre.h"
+#include "gxarith.h"
+
+/*
+ * Define sine and cosine functions that take angles in degrees rather than
+ * radians, hit exact values at multiples of 90 degrees, and are implemented
+ * efficiently on machines with slow (or no) floating point.
+ */
+double gs_sin_degrees(double angle);
+double gs_cos_degrees(double angle);
+typedef struct gs_sincos_s {
+    double sin, cos;
+    bool orthogonal;		/* angle is multiple of 90 degrees */
+} gs_sincos_t;
+void gs_sincos_degrees(double angle, gs_sincos_t * psincos);
+
+/*
+ * Define an atan2 function that returns an angle in degrees and uses
+ * the PostScript quadrant rules.  Note that it may return
+ * gs_error_undefinedresult.
+ */
+int gs_atan2_degrees(double y, double x, double *pangle);
+
+#endif /* gxfarith_INCLUDED */