unresolved external symbol _clCreateEventFromGLsyncKHR

Get linker error when including cl_gl_ext.h.
The same as this thread but with a different GPU: http://www.khronos.org/message_boards/showthread.php/8431-clCreateEventFromGLsyncKHR

Setup:
CUDA 5.0 (64-bit) and Geforce 670 GPU.