problem with nvmex compilation

hi,

 i have cuda toolkit 5 installed. inside matlab i can use "nvmex prog.cu" to compile a cuda program. then i installed "NVIDIA Nsight Visual Studio Edition" to be able to use the debugger from within visual studio. but as a result my "nvmex prog.cu" stopped working and i get __cudart_builtin__ error for many header files inside cuda toolkit 5. can someone please provide any insight what is going wrong and how to fix it.