Index: draw_eps.h
===================================================================
--- draw_eps.h	(revision 36261)
+++ draw_eps.h	(revision 36262)
@@ -13,6 +13,12 @@
 	int lastcap;
 	int lastcolor;
 	rnd_composite_op_t drawing_mode;
+
+	/* Spare: see doc/developer/spare.txt */
+	void (*spare_f1)(void), (*spare_f2)(void);
+	long spare_l1, spare_l2, spare_l3, spare_l4;
+	void *spare_p1, *spare_p2, *spare_p3, *spare_p4;
+	double spare_d1, spare_d2, spare_d3, spare_d4;
 } rnd_eps_t;
 
 void rnd_eps_init(rnd_eps_t *pctx, rnd_box_t bounds, double scale, int in_mono, int as_shown);
Index: draw_ps.h
===================================================================
--- draw_ps.h	(revision 36261)
+++ draw_ps.h	(revision 36262)
@@ -30,6 +30,12 @@
 	/* private: pcb-rnd leftover */
 	rnd_bool is_mask;
 	rnd_bool is_drill;
+
+	/* Spare: see doc/developer/spare.txt */
+	void (*spare_f1)(void), (*spare_f2)(void);
+	long spare_l1, spare_l2, spare_l3, spare_l4;
+	void *spare_p1, *spare_p2, *spare_p3, *spare_p4;
+	double spare_d1, spare_d2, spare_d3, spare_d4;
 } rnd_ps_t;
 
 void rnd_ps_init(rnd_ps_t *pctx, rnd_hidlib_t *hidlib, FILE *f, int media_idx, int fillpage, double scale_factor);