diff -Naur inkscapelite-0.36.3ORIG/src/widgets/ruler.c inkscapelite-0.36.3/src/widgets/ruler.c
--- inkscapelite-0.36.3ORIG/src/widgets/ruler.c	2003-10-31 04:48:05.000000000 +0800
+++ inkscapelite-0.36.3/src/widgets/ruler.c	2016-04-16 21:32:49.829953278 +0800
@@ -298,6 +298,13 @@
 
 	  ruler->xsrc = x;
 	  ruler->ysrc = y;
+
+      if (!ruler->non_gr_exp_gc)
+        {
+          ruler->non_gr_exp_gc = gdk_gc_new (widget->window);
+          gdk_gc_set_exposures (ruler->non_gr_exp_gc, FALSE);
+        }
+
 	}
     }
 }
@@ -581,6 +588,13 @@
 
 	  ruler->xsrc = x;
 	  ruler->ysrc = y;
+
+      if (!ruler->non_gr_exp_gc)
+        {
+          ruler->non_gr_exp_gc = gdk_gc_new (widget->window);
+          gdk_gc_set_exposures (ruler->non_gr_exp_gc, FALSE);
+        }
+
 	}
     }
 }