diff -r dee5afe5301f -r 3f74d0d4af4c src/corelib/tools/qmap.h
--- a/src/corelib/tools/qmap.h	Mon Mar 15 12:43:09 2010 +0200
+++ b/src/corelib/tools/qmap.h	Thu Apr 08 14:19:33 2010 +0300
@@ -213,7 +213,7 @@
 
     public:
         typedef std::bidirectional_iterator_tag iterator_category;
-        typedef ptrdiff_t difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef T *pointer;
         typedef T &reference;
@@ -281,7 +281,7 @@
 
     public:
         typedef std::bidirectional_iterator_tag iterator_category;
-        typedef ptrdiff_t difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef const T *pointer;
         typedef const T &reference;
@@ -384,7 +384,7 @@
     // STL compatibility
     typedef Key key_type;
     typedef T mapped_type;
-    typedef ptrdiff_t difference_type;
+    typedef qptrdiff difference_type;
     typedef int size_type;
     inline bool empty() const { return isEmpty(); }