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["Laurent Rineau (GeometryFactory)" <>]

Arun, the explanation is in the message you quoted yourself:

On Tuesday 20 October 2009 11:04:38 pratihast22089 wrote:
> CMake Error at cmake/modules/FindQt4.cmake:783 (MESSAGE):
>   It appears you're trying to use Visual Studio with Qt built by mingw

If you want to use Qt4 with Visual Studio 9, you need to recompile Qt 
yourself 
from sources. You seem to have installed Qt3 precompiled binaries for the 
MinGW compiler. Apparently the CMake macro FindQt4.cmake throws a fatal error 
if it detects that bad combination of (Qt binaries)+compiler.

-- 
Laurent Rineau, PhD
R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
Release Manager of the CGAL Project       http://www.cgal.org/