cl_platform.h': No such file or directory

Dears ,
I am trying to run code written in OpenCL on an NVIDIA GPU.

[li]I installed NVIDIA GPU Computing Tool Kit[/li][li]I added the include and lib path to my project properties[/li][li]I set the environment variable by the path of bin[/li][/ul]

But I get this error:

CL/cl_platform.h': No such file or directory

I notice my project confused between these paths:
[li]C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v4.1\include (which has Cl/cl_platform.h but project do not see it although I set it in include properties )[/li]
[li]C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\CL[/li][/ol]

I need the first path but it only sees the second path. What should I do ?