title: Cuda Toolkit directory does not exist
body: <p>I have a problem with cuda 4.1 and visual studio 2010.
  When I want to compile a .cu-file I get the following error:</p>
  
  <pre><code>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\BuildCustomizations\CUDA 4.1.targets(249,9): error : The CUDA Toolkit  directory '' does not exist.  Please verify the CUDA Toolkit is installed properly or define the CudaToolkitDir property to resolve this error.
  </code></pre>
  
  <p>I got a clean windows 7 install with only vs2010, CUDA Toolkit v4.1 and the NVIDIA GPU Computing SDK (and git) running inside a VirtualBox. </p>
  
  <p>I tried to specify the toolkit directory in the project properties in "CUDA Toolkit Custom Dir", but that doesn't make any difference. Even in a completely new VBox this error occurs.</p>
  
  <p>Thanks for your help!</p>