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diff --git a/src/include/optimizer/geqo_recombination.h b/src/include/optimizer/geqo_recombination.h
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+/*-------------------------------------------------------------------------
+ *
+ * geqo_recombination.h
+ *	  prototypes for recombination in the genetic query optimizer
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/optimizer/geqo_recombination.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+/* contributed by:
+   =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
+   *  Martin Utesch				 * Institute of Automatic Control	   *
+   =							 = University of Mining and Technology =
+   *  utesch@aut.tu-freiberg.de  * Freiberg, Germany				   *
+   =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
+ */
+
+/* -- parts of this are adapted from D. Whitley's Genitor algorithm -- */
+
+#ifndef GEQO_RECOMBINATION_H
+#define GEQO_RECOMBINATION_H
+
+#include "optimizer/geqo.h"
+
+
+extern void init_tour(PlannerInfo *root, Gene *tour, int num_gene);
+
+
+/* edge recombination crossover [ERX] */
+
+typedef struct Edge
+{
+	Gene		edge_list[4];	/* list of edges */
+	int			total_edges;
+	int			unused_edges;
+} Edge;
+
+extern Edge *alloc_edge_table(PlannerInfo *root, int num_gene);
+extern void free_edge_table(PlannerInfo *root, Edge *edge_table);
+
+extern float gimme_edge_table(PlannerInfo *root, Gene *tour1, Gene *tour2,
+							  int num_gene, Edge *edge_table);
+
+extern int	gimme_tour(PlannerInfo *root, Edge *edge_table, Gene *new_gene,
+					   int num_gene);
+
+
+/* partially matched crossover [PMX] */
+
+#define DAD 1					/* indicator for gene from dad */
+#define MOM 0					/* indicator for gene from mom */
+
+extern void pmx(PlannerInfo *root,
+				Gene *tour1, Gene *tour2,
+				Gene *offspring, int num_gene);
+
+
+typedef struct City
+{
+	int			tour2_position;
+	int			tour1_position;
+	int			used;
+	int			select_list;
+}			City;
+
+extern City * alloc_city_table(PlannerInfo *root, int num_gene);
+extern void free_city_table(PlannerInfo *root, City * city_table);
+
+/* cycle crossover [CX] */
+extern int	cx(PlannerInfo *root, Gene *tour1, Gene *tour2,
+			   Gene *offspring, int num_gene, City * city_table);
+
+/* position crossover [PX] */
+extern void px(PlannerInfo *root, Gene *tour1, Gene *tour2, Gene *offspring,
+			   int num_gene, City * city_table);
+
+/* order crossover [OX1] according to Davis */
+extern void ox1(PlannerInfo *root, Gene *mom, Gene *dad, Gene *offspring,
+				int num_gene, City * city_table);
+
+/* order crossover [OX2] according to Syswerda */
+extern void ox2(PlannerInfo *root, Gene *mom, Gene *dad, Gene *offspring,
+				int num_gene, City * city_table);
+
+#endif							/* GEQO_RECOMBINATION_H */