https://github.com/MyGUI/mygui/commit/ced30dac10082ff9593a2c971d26b3aebce6b2be.patch
https://bugs.gentoo.org/732778

Part of:

From ced30dac10082ff9593a2c971d26b3aebce6b2be Mon Sep 17 00:00:00 2001
From: George Evmenov <george.evmenov@geocv.com>
Date: Fri, 26 Jun 2015 12:25:26 +0300
Subject: [PATCH] do not use nullptr define

--- a/MyGUIEngine/include/MyGUI_Prerequest.h
+++ b/MyGUIEngine/include/MyGUI_Prerequest.h
@@ -19,13 +19,7 @@
 #define MYGUI_DEFINE_VERSION(major, minor, patch) ((major << 16) | (minor << 8) | patch)
 
 #ifndef MYGUI_DONT_REPLACE_NULLPTR
-#	if MYGUI_COMPILER == MYGUI_COMPILER_MSVC
-#		ifndef _MANAGED
-#			ifndef _NATIVE_NULLPTR_SUPPORTED
-#				define nullptr 0
-#			endif
-#		endif
-#	else
+#	if __cplusplus < 201103L && !defined(_NATIVE_NULLPTR_SUPPORTED)
 #		define nullptr 0
 #	endif
 #endif