Index: dlg_fontsel.c
===================================================================
--- dlg_fontsel.c	(revision 37070)
+++ dlg_fontsel.c	(revision 37071)
@@ -72,7 +72,7 @@
 		memset(ctx, 0, sizeof(fontsel_ctx_t));
 }
 
-void fontsel_expose_cb(rnd_hid_attribute_t *attrib, rnd_hid_preview_t *prv, rnd_hid_gc_t gc, const rnd_hid_expose_ctx_t *e)
+void fontsel_expose_cb(rnd_hid_attribute_t *attrib, rnd_hid_preview_t *prv, rnd_hid_gc_t gc, rnd_hid_expose_ctx_t *e)
 {
 	fontsel_ctx_t *ctx = prv->user_ctx;
 
Index: dlg_lib_pstk.c
===================================================================
--- dlg_lib_pstk.c	(revision 37070)
+++ dlg_lib_pstk.c	(revision 37071)
@@ -152,7 +152,7 @@
 	ps->ID = -1; /* disable undo and clipping */
 }
 
-static void pstklib_expose(rnd_hid_attribute_t *attrib, rnd_hid_preview_t *prv, rnd_hid_gc_t gc, const rnd_hid_expose_ctx_t *e)
+static void pstklib_expose(rnd_hid_attribute_t *attrib, rnd_hid_preview_t *prv, rnd_hid_gc_t gc, rnd_hid_expose_ctx_t *e)
 {
 	pstk_lib_ctx_t *ctx = prv->user_ctx;
 	pcb_data_t *data = get_data(ctx, ctx->subc_id, NULL);
Index: dlg_library.c
===================================================================
--- dlg_library.c	(revision 37070)
+++ dlg_library.c	(revision 37071)
@@ -363,7 +363,7 @@
 
 }
 
-static void library_expose(rnd_hid_attribute_t *attrib, rnd_hid_preview_t *prv, rnd_hid_gc_t gc, const rnd_hid_expose_ctx_t *e)
+static void library_expose(rnd_hid_attribute_t *attrib, rnd_hid_preview_t *prv, rnd_hid_gc_t gc, rnd_hid_expose_ctx_t *e)
 {
 	library_ctx_t *ctx = prv->user_ctx;
 	int orig_po = pcb_draw_force_termlab;
Index: dlg_pinout.c
===================================================================
--- dlg_pinout.c	(revision 37070)
+++ dlg_pinout.c	(revision 37071)
@@ -56,7 +56,7 @@
 }
 
 
-static void pinout_expose(rnd_hid_attribute_t *attrib, rnd_hid_preview_t *prv, rnd_hid_gc_t gc, const rnd_hid_expose_ctx_t *e)
+static void pinout_expose(rnd_hid_attribute_t *attrib, rnd_hid_preview_t *prv, rnd_hid_gc_t gc, rnd_hid_expose_ctx_t *e)
 {
 	pinout_ctx_t *ctx = prv->user_ctx;
 	void *r1, *r2, *r3;
Index: dlg_pref_layer.c
===================================================================
--- dlg_pref_layer.c	(revision 37070)
+++ dlg_pref_layer.c	(revision 37071)
@@ -34,7 +34,7 @@
 #define RND_EMPTY(a)           ((a) ? (a) : "")
 
 
-void layersel_expose_cb(rnd_hid_attribute_t *attrib, rnd_hid_preview_t *prv, rnd_hid_gc_t gc, const rnd_hid_expose_ctx_t *e)
+void layersel_expose_cb(rnd_hid_attribute_t *attrib, rnd_hid_preview_t *prv, rnd_hid_gc_t gc, rnd_hid_expose_ctx_t *e)
 {
 	pcb_stub_draw_csect(gc, e);
 }
Index: dlg_test.c
===================================================================
--- dlg_test.c	(revision 37070)
+++ dlg_test.c	(revision 37071)
@@ -63,7 +63,7 @@
 static void cb_text_offs(void *hid_ctx, void *caller_data, rnd_hid_attribute_t *attr);
 static void cb_text_ro(void *hid_ctx, void *caller_data, rnd_hid_attribute_t *attr);
 
-static void prv_expose(rnd_hid_attribute_t *attrib, rnd_hid_preview_t *prv, rnd_hid_gc_t gc, const rnd_hid_expose_ctx_t *e);
+static void prv_expose(rnd_hid_attribute_t *attrib, rnd_hid_preview_t *prv, rnd_hid_gc_t gc, rnd_hid_expose_ctx_t *e);
 static rnd_bool prv_mouse(rnd_hid_attribute_t *attrib, rnd_hid_preview_t *prv, rnd_hid_mouse_ev_t kind, rnd_coord_t x, rnd_coord_t y);
 
 static const char * test_xpm[] = {
@@ -508,7 +508,7 @@
 	txt->hid_set_readonly(atxt, hid_ctx, ctx->txtro);
 }
 
-static void prv_expose(rnd_hid_attribute_t *attrib, rnd_hid_preview_t *prv, rnd_hid_gc_t gc, const rnd_hid_expose_ctx_t *e)
+static void prv_expose(rnd_hid_attribute_t *attrib, rnd_hid_preview_t *prv, rnd_hid_gc_t gc, rnd_hid_expose_ctx_t *e)
 {
 	rnd_render->set_color(gc, rnd_color_red);
 	pcb_text_draw_string_simple(NULL, "foo", RND_MM_TO_COORD(1), RND_MM_TO_COORD(20), 5.0, 5.0, 10.0, 0, 0, 0, 0, 0);