--- 4.8.4/qmake/generators/win32/msbuild_objectmodel.cpp	2013-04-24 17:52:47 +0100
+++ 4.8.4-src/qmake/generators/win32/msbuild_objectmodel.cpp	2013-04-22 20:55:15 +0100
@@ -1572,6 +1572,7 @@
             << attrTagS(_UseOfATL, toString(tool.UseOfATL))
             << attrTagS(_UseOfMfc, toString(tool.UseOfMfc))
             << attrTagT(_WholeProgramOptimization, tool.WholeProgramOptimization)
+            << attrTagS("PlatformToolset", qgetenv("PlatformToolset").constData())
         << closetag();
 }