missing includes for clang

games/dustrac/patches/patch-src_editor_editorview_cpp

@@ -0,0 +1,13 @@
+$OpenBSD: patch-src_editor_editorview_cpp,v 1.1 2017/05/22 13:48:39 espie Exp $
+
+Index: src/editor/editorview.cpp
+--- src/editor/editorview.cpp.orig
++++ src/editor/editorview.cpp
+@@ -35,6 +35,7 @@
+ #include "tracktile.hpp"
+ 
+ #include <cassert>
++#include <cstdlib>
+ 
+ EditorView::EditorView(EditorData & editorData, QWidget * parent)
+ : QGraphicsView(parent)