--- nova/exact_backtrack.c.orig	Fri May 15 00:41:14 1992
+++ nova/exact_backtrack.c	Thu Aug  3 22:34:01 2000
@@ -9,6 +9,10 @@
  */
 #include "nova.h"
 
+#ifdef __FreeBSD__
+extern char *a_inter_b(char *a, char *b, int constr_card, int dim);
+#endif
+
 /******************************************************************************
 *                         Upper level backtracking                            *
 ******************************************************************************/
@@ -836,7 +840,11 @@
     SONS_LINK *son_scanner;
     CONSTRAINT_E *scanner,*constrptr,*inter_ptr,*exist_son(); 
     char *new_code,*inter_code,*gen_newcode_cat1(),*gen_newcode_cat2(),
-	 *gen_newcode_cat3(),*a_inter_b();
+	 *gen_newcode_cat3()
+#ifndef __FreeBSD__
+	 ,*a_inter_b()
+#endif
+	 ;
     int level;
     BOOLEAN ok_to_code;
       
@@ -1161,7 +1169,11 @@
 {
 
     FATHERS_LINK *father_scanner;
-    char *ft_inter,*a_inter_b(),*prov_ptr;
+    char *ft_inter,
+#ifndef __FreeBSD__
+    *a_inter_b(),
+#endif
+    *prov_ptr;
     BOOLEAN flag;
     int i;
 
@@ -1340,7 +1352,11 @@
 {
 
     CONSTRAINT_E *constrptr;
-    char *inter_code,*inter_constr,*a_inter_b(),*c1_inter_c2();
+    char *inter_code,*inter_constr,
+#ifndef __FreeBSD_
+    *a_inter_b(),
+#endif
+    *c1_inter_c2();
     int i,state_pos1,state_pos2;
 
     for (i = graph_depth-1; i >= 0; i--) {