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diff --git a/src/include/utils/geo_decls.h b/src/include/utils/geo_decls.h
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+/*-------------------------------------------------------------------------
+ *
+ * geo_decls.h - Declarations for various 2D constructs.
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/utils/geo_decls.h
+ *
+ *	  XXX These routines were not written by a numerical analyst.
+ *
+ *	  XXX I have made some attempt to flesh out the operators
+ *		and data types. There are still some more to do. - tgl 97/04/19
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef GEO_DECLS_H
+#define GEO_DECLS_H
+
+#include <math.h>
+
+#include "fmgr.h"
+
+/*--------------------------------------------------------------------
+ * Useful floating point utilities and constants.
+ *--------------------------------------------------------------------
+ *
+ * "Fuzzy" floating-point comparisons: values within EPSILON of each other
+ * are considered equal.  Beware of normal reasoning about the behavior of
+ * these comparisons, since for example FPeq does not behave transitively.
+ *
+ * Note that these functions are not NaN-aware and will give FALSE for
+ * any case involving NaN inputs.
+ *
+ * Also note that these will give sane answers for infinite inputs,
+ * where it's important to avoid computing Inf minus Inf; we do so
+ * by eliminating equality cases before subtracting.
+ */
+
+#define EPSILON					1.0E-06
+
+#ifdef EPSILON
+#define FPzero(A)				(fabs(A) <= EPSILON)
+
+static inline bool
+FPeq(double A, double B)
+{
+	return A == B || fabs(A - B) <= EPSILON;
+}
+
+static inline bool
+FPne(double A, double B)
+{
+	return A != B && fabs(A - B) > EPSILON;
+}
+
+static inline bool
+FPlt(double A, double B)
+{
+	return A + EPSILON < B;
+}
+
+static inline bool
+FPle(double A, double B)
+{
+	return A <= B + EPSILON;
+}
+
+static inline bool
+FPgt(double A, double B)
+{
+	return A > B + EPSILON;
+}
+
+static inline bool
+FPge(double A, double B)
+{
+	return A + EPSILON >= B;
+}
+#else
+#define FPzero(A)				((A) == 0)
+#define FPeq(A,B)				((A) == (B))
+#define FPne(A,B)				((A) != (B))
+#define FPlt(A,B)				((A) < (B))
+#define FPle(A,B)				((A) <= (B))
+#define FPgt(A,B)				((A) > (B))
+#define FPge(A,B)				((A) >= (B))
+#endif
+
+#define HYPOT(A, B)				pg_hypot(A, B)
+
+/*---------------------------------------------------------------------
+ * Point - (x,y)
+ *-------------------------------------------------------------------*/
+typedef struct
+{
+	float8		x,
+				y;
+} Point;
+
+
+/*---------------------------------------------------------------------
+ * LSEG - A straight line, specified by endpoints.
+ *-------------------------------------------------------------------*/
+typedef struct
+{
+	Point		p[2];
+} LSEG;
+
+
+/*---------------------------------------------------------------------
+ * PATH - Specified by vertex points.
+ *-------------------------------------------------------------------*/
+typedef struct
+{
+	int32		vl_len_;		/* varlena header (do not touch directly!) */
+	int32		npts;
+	int32		closed;			/* is this a closed polygon? */
+	int32		dummy;			/* padding to make it double align */
+	Point		p[FLEXIBLE_ARRAY_MEMBER];
+} PATH;
+
+
+/*---------------------------------------------------------------------
+ * LINE - Specified by its general equation (Ax+By+C=0).
+ *-------------------------------------------------------------------*/
+typedef struct
+{
+	float8		A,
+				B,
+				C;
+} LINE;
+
+
+/*---------------------------------------------------------------------
+ * BOX	- Specified by two corner points, which are
+ *		 sorted to save calculation time later.
+ *-------------------------------------------------------------------*/
+typedef struct
+{
+	Point		high,
+				low;			/* corner POINTs */
+} BOX;
+
+/*---------------------------------------------------------------------
+ * POLYGON - Specified by an array of doubles defining the points,
+ *		keeping the number of points and the bounding box for
+ *		speed purposes.
+ *-------------------------------------------------------------------*/
+typedef struct
+{
+	int32		vl_len_;		/* varlena header (do not touch directly!) */
+	int32		npts;
+	BOX			boundbox;
+	Point		p[FLEXIBLE_ARRAY_MEMBER];
+} POLYGON;
+
+/*---------------------------------------------------------------------
+ * CIRCLE - Specified by a center point and radius.
+ *-------------------------------------------------------------------*/
+typedef struct
+{
+	Point		center;
+	float8		radius;
+} CIRCLE;
+
+/*
+ * fmgr interface macros
+ *
+ * Path and Polygon are toastable varlena types, the others are just
+ * fixed-size pass-by-reference types.
+ */
+
+#define DatumGetPointP(X)	 ((Point *) DatumGetPointer(X))
+#define PointPGetDatum(X)	 PointerGetDatum(X)
+#define PG_GETARG_POINT_P(n) DatumGetPointP(PG_GETARG_DATUM(n))
+#define PG_RETURN_POINT_P(x) return PointPGetDatum(x)
+
+#define DatumGetLsegP(X)	((LSEG *) DatumGetPointer(X))
+#define LsegPGetDatum(X)	PointerGetDatum(X)
+#define PG_GETARG_LSEG_P(n) DatumGetLsegP(PG_GETARG_DATUM(n))
+#define PG_RETURN_LSEG_P(x) return LsegPGetDatum(x)
+
+#define DatumGetPathP(X)		 ((PATH *) PG_DETOAST_DATUM(X))
+#define DatumGetPathPCopy(X)	 ((PATH *) PG_DETOAST_DATUM_COPY(X))
+#define PathPGetDatum(X)		 PointerGetDatum(X)
+#define PG_GETARG_PATH_P(n)		 DatumGetPathP(PG_GETARG_DATUM(n))
+#define PG_GETARG_PATH_P_COPY(n) DatumGetPathPCopy(PG_GETARG_DATUM(n))
+#define PG_RETURN_PATH_P(x)		 return PathPGetDatum(x)
+
+#define DatumGetLineP(X)	((LINE *) DatumGetPointer(X))
+#define LinePGetDatum(X)	PointerGetDatum(X)
+#define PG_GETARG_LINE_P(n) DatumGetLineP(PG_GETARG_DATUM(n))
+#define PG_RETURN_LINE_P(x) return LinePGetDatum(x)
+
+#define DatumGetBoxP(X)    ((BOX *) DatumGetPointer(X))
+#define BoxPGetDatum(X)    PointerGetDatum(X)
+#define PG_GETARG_BOX_P(n) DatumGetBoxP(PG_GETARG_DATUM(n))
+#define PG_RETURN_BOX_P(x) return BoxPGetDatum(x)
+
+#define DatumGetPolygonP(X)			((POLYGON *) PG_DETOAST_DATUM(X))
+#define DatumGetPolygonPCopy(X)		((POLYGON *) PG_DETOAST_DATUM_COPY(X))
+#define PolygonPGetDatum(X)			PointerGetDatum(X)
+#define PG_GETARG_POLYGON_P(n)		DatumGetPolygonP(PG_GETARG_DATUM(n))
+#define PG_GETARG_POLYGON_P_COPY(n) DatumGetPolygonPCopy(PG_GETARG_DATUM(n))
+#define PG_RETURN_POLYGON_P(x)		return PolygonPGetDatum(x)
+
+#define DatumGetCircleP(X)	  ((CIRCLE *) DatumGetPointer(X))
+#define CirclePGetDatum(X)	  PointerGetDatum(X)
+#define PG_GETARG_CIRCLE_P(n) DatumGetCircleP(PG_GETARG_DATUM(n))
+#define PG_RETURN_CIRCLE_P(x) return CirclePGetDatum(x)
+
+
+/*
+ * in geo_ops.c
+ */
+
+extern float8 pg_hypot(float8 x, float8 y);
+
+#endif							/* GEO_DECLS_H */