diff --git a/Circular_kernel_3/demo/Circular_kernel_3/images/arrow_01_down.xpm b/Circular_kernel_3/demo/Circular_kernel_3/images/arrow_01_down.xpm
index 855cd30bdf2..77b762bb25d 100644
--- a/Circular_kernel_3/demo/Circular_kernel_3/images/arrow_01_down.xpm
+++ b/Circular_kernel_3/demo/Circular_kernel_3/images/arrow_01_down.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char * arrow_01_down_xpm[] = {
+static const char * arrow_01_down_xpm[] = {
 "30 29 257 2",
 "  	c None",
 ". 	c #000000",
diff --git a/Circular_kernel_3/demo/Circular_kernel_3/images/arrow_01_left.xpm b/Circular_kernel_3/demo/Circular_kernel_3/images/arrow_01_left.xpm
index 72a25274426..7c1600ef486 100644
--- a/Circular_kernel_3/demo/Circular_kernel_3/images/arrow_01_left.xpm
+++ b/Circular_kernel_3/demo/Circular_kernel_3/images/arrow_01_left.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char * arrow_01_left_xpm[] = {
+static const char * arrow_01_left_xpm[] = {
 "29 30 257 2",
 "  	c None",
 ". 	c #000000",
diff --git a/Circular_kernel_3/demo/Circular_kernel_3/images/arrow_01_right.xpm b/Circular_kernel_3/demo/Circular_kernel_3/images/arrow_01_right.xpm
index 22d145ace8c..0f0f25e395f 100644
--- a/Circular_kernel_3/demo/Circular_kernel_3/images/arrow_01_right.xpm
+++ b/Circular_kernel_3/demo/Circular_kernel_3/images/arrow_01_right.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char * arrow_01_right_xpm[] = {
+static const char * arrow_01_right_xpm[] = {
 "29 30 257 2",
 "  	c None",
 ". 	c #000000",
diff --git a/Circular_kernel_3/demo/Circular_kernel_3/images/arrow_01_up.xpm b/Circular_kernel_3/demo/Circular_kernel_3/images/arrow_01_up.xpm
index 6c5f8e66c82..502bcb33a87 100644
--- a/Circular_kernel_3/demo/Circular_kernel_3/images/arrow_01_up.xpm
+++ b/Circular_kernel_3/demo/Circular_kernel_3/images/arrow_01_up.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char * arrow_01_up_xpm[] = {
+static const char * arrow_01_up_xpm[] = {
 "30 29 257 2",
 "  	c None",
 ". 	c #000000",
diff --git a/Circular_kernel_3/demo/Circular_kernel_3/images/button_solid.xpm b/Circular_kernel_3/demo/Circular_kernel_3/images/button_solid.xpm
index c5df09e77b0..e90a356b889 100644
--- a/Circular_kernel_3/demo/Circular_kernel_3/images/button_solid.xpm
+++ b/Circular_kernel_3/demo/Circular_kernel_3/images/button_solid.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char * button_solid_xpm[] = {
+static const char * button_solid_xpm[] = {
 "28 27 5 1",
 " 	c None",
 ".	c #000000",
diff --git a/Circular_kernel_3/demo/Circular_kernel_3/images/button_wire.xpm b/Circular_kernel_3/demo/Circular_kernel_3/images/button_wire.xpm
index e7ac0b66f08..6353c2df19d 100644
--- a/Circular_kernel_3/demo/Circular_kernel_3/images/button_wire.xpm
+++ b/Circular_kernel_3/demo/Circular_kernel_3/images/button_wire.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char * button_wire_xpm[] = {
+static const char * button_wire_xpm[] = {
 "28 27 2 1",
 " 	c None",
 ".	c #000000",
diff --git a/Circular_kernel_3/demo/Circular_kernel_3/images/d_solid_b.xpm b/Circular_kernel_3/demo/Circular_kernel_3/images/d_solid_b.xpm
index 023ab24a574..b2d02a82142 100644
--- a/Circular_kernel_3/demo/Circular_kernel_3/images/d_solid_b.xpm
+++ b/Circular_kernel_3/demo/Circular_kernel_3/images/d_solid_b.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char * d_solid_b_xpm[] = {
+static const char * d_solid_b_xpm[] = {
 "36 34 249 2",
 "  	c #000000",
 ". 	c #800000",
diff --git a/Circular_kernel_3/demo/Circular_kernel_3/images/d_wire_b.xpm b/Circular_kernel_3/demo/Circular_kernel_3/images/d_wire_b.xpm
index 5b2cd1cc037..9cb7cbdd747 100644
--- a/Circular_kernel_3/demo/Circular_kernel_3/images/d_wire_b.xpm
+++ b/Circular_kernel_3/demo/Circular_kernel_3/images/d_wire_b.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char * d_wire_b_xpm[] = {
+static const char * d_wire_b_xpm[] = {
 "36 34 249 2",
 "  	c #000000",
 ". 	c #800000",
diff --git a/Circular_kernel_3/demo/Circular_kernel_3/images/zoom_in.xpm b/Circular_kernel_3/demo/Circular_kernel_3/images/zoom_in.xpm
index ea71c6f2a46..40e894abfb0 100644
--- a/Circular_kernel_3/demo/Circular_kernel_3/images/zoom_in.xpm
+++ b/Circular_kernel_3/demo/Circular_kernel_3/images/zoom_in.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char * zoom_in_xpm[] = {
+static const char * zoom_in_xpm[] = {
 "16 16 110 2",
 "  	c None",
 ". 	c #000000",
diff --git a/Circular_kernel_3/demo/Circular_kernel_3/images/zoom_out.xpm b/Circular_kernel_3/demo/Circular_kernel_3/images/zoom_out.xpm
index f73084de23d..371ad2e2565 100644
--- a/Circular_kernel_3/demo/Circular_kernel_3/images/zoom_out.xpm
+++ b/Circular_kernel_3/demo/Circular_kernel_3/images/zoom_out.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char * zoom_out_xpm[] = {
+static const char * zoom_out_xpm[] = {
 "16 16 114 2",
 "  	c None",
 ". 	c #000000",