Index: trunk/src/obj_arc_ui.c
===================================================================
--- trunk/src/obj_arc_ui.c	(revision 5280)
+++ trunk/src/obj_arc_ui.c	(revision 5281)
@@ -27,6 +27,8 @@
 
 #include "config.h"
 #include "obj_arc_ui.h"
+#include "obj_arc.h"
+#include "box.h"
 
 #include <stdio.h>
 
@@ -35,3 +37,17 @@
 	fprintf(stderr, "Moving arc endpoint: not yet implemented\n");
 }
 
+int pcb_obj_ui_arc_point_bbox(int Type, void *Ptr1, void *Ptr2, void *Ptr3, pcb_box_t *res)
+{
+	pcb_arc_t *arc = Ptr2;
+	int *end_pt = Ptr3;
+	pcb_box_t *ends = pcb_arc_get_ends(arc);
+
+	if (end_pt == NULL)
+		*res = pcb_point_box(ends->X1, ends->Y1);
+	else
+		*res = pcb_point_box(ends->X2, ends->Y2);
+
+	return 0;
+}
+
Index: trunk/src/obj_arc_ui.h
===================================================================
--- trunk/src/obj_arc_ui.h	(revision 5280)
+++ trunk/src/obj_arc_ui.h	(revision 5281)
@@ -27,4 +27,5 @@
 #include "crosshair.h"
 
 void pcb_arc_ui_move_or_copy(pcb_crosshair_t *ch);
+int pcb_obj_ui_arc_point_bbox(int Type, void *Ptr1, void *Ptr2, void *Ptr3, pcb_box_t *res);
 
Index: trunk/src/obj_common.c
===================================================================
--- trunk/src/obj_common.c	(revision 5280)
+++ trunk/src/obj_common.c	(revision 5281)
@@ -59,7 +59,7 @@
 		*res = *(pcb_box_t *)Ptr3;
 		return 0;
 	case PCB_TYPE_ARC_POINT:
-/*		abort();*/
+		return pcb_obj_ui_arc_point_bbox(Type, Ptr1, Ptr2, Ptr3, res);
 	default:
 		pcb_message(PCB_MSG_DEFAULT, "Request for bounding box of unsupported type %d\n", Type);
 		*res = *(pcb_box_t *)Ptr2;