--- slime73-sdl-experiments-618662dc9e82/src/video/uikit/SDL_uikitopenglview.m.orig	2015-08-20 16:09:59.000000000 +0200
+++ slime73-sdl-experiments-618662dc9e82/src/video/uikit/SDL_uikitopenglview.m	2015-08-20 16:11:25.000000000 +0200
@@ -99,7 +99,7 @@
 
         CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;
 
-        eaglLayer.opaque = YES;
+        eaglLayer.opaque = SDL_getenv("UIKIT_TRANSPARENT") ? NO : YES;
         eaglLayer.drawableProperties = @{
             kEAGLDrawablePropertyRetainedBacking:@(retained),
             kEAGLDrawablePropertyColorFormat:colorFormat