--- plugins/background/MMsBingMapBackground/msbingmapadapter.h.orig	2010-12-20 18:05:31.000000000 +0100
+++ plugins/background/MMsBingMapBackground/msbingmapadapter.h	2010-12-20 18:06:29.000000000 +0100
@@ -13,6 +13,8 @@
     QRectF bbox;
 };
 
+#define log2(x) (log(x) / M_LN2)
+
 //! MapAdapter for Ms Bing Maps
 /*!
  * This is a conveniece class, which extends and configures a TileMapAdapter
