Index: sky.c
===================================================================
--- sky.c	(revision 733)
+++ sky.c	(revision 734)
@@ -57,6 +57,12 @@
 GLfloat minv=(x-5);
 */
 
+if(!raydium_sky_prefix_defined)
+    {
+    raydium_sky_box_cache();
+    raydium_sky_prefix_defined=1;
+    }
+
 if(raydium_fog_enabled_tag && !raydium_sky_force) return;
 
 glDisable(GL_LIGHTING);