I'm compiling OpenCV [[OpenCV]] Rev. 6947 on Ubuntu 11.04 64bit and the following error arises:

[ 98%] Built target example_gpu_cascadeclassifier_nvidia_api
Linking CXX executable ../../bin/driver_api_multi_gpu
CMakeFiles/example_gpu_driver_api_multi.dir/driver_api_multi.cpp.o: In function @destroyContexts()':
driver_api_multi.cpp:(.text._Z15destroyContextsv+0x9): undefined reference to @cuCtxDestroy_v2'
driver_api_multi.cpp:(.text._Z15destroyContextsv+0x1b): undefined reference to @cuCtxDestroy_v2'
CMakeFiles/example_gpu_driver_api_multi.dir/driver_api_multi.cpp.o: In function @Worker::operator()(int) const':
driver_api_multi.cpp:(.text._ZNK6WorkerclEi+0x19): undefined reference to @cuCtxPushCurrent_v2'
driver_api_multi.cpp:(.text._ZNK6WorkerclEi+0x76d): undefined reference to @cuCtxPopCurrent_v2'
CMakeFiles/example_gpu_driver_api_multi.dir/driver_api_multi.cpp.o: In function @main':
driver_api_multi.cpp:(.text.main+0xa6): undefined reference to @cuInit'
driver_api_multi.cpp:(.text.main+0xbc): undefined reference to @cuDeviceGet'
driver_api_multi.cpp:(.text.main+0xd6): undefined reference to @cuCtxCreate_v2'
driver_api_multi.cpp:(.text.main+0xea): undefined reference to @cuCtxPopCurrent_v2'
driver_api_multi.cpp:(.text.main+0x103): undefined reference to @cuDeviceGet'
driver_api_multi.cpp:(.text.main+0x11d): undefined reference to @cuCtxCreate_v2'
driver_api_multi.cpp:(.text.main+0x131): undefined reference to @cuCtxPopCurrent_v2'
driver_api_multi.cpp:(.text.main+0x198): undefined reference to @cuCtxDestroy_v2'
driver_api_multi.cpp:(.text.main+0x1ae): undefined reference to @cuCtxDestroy_v2'
collect2: ld returned 1 exit status
maker2: *** [bin/driver_api_multi_gpu] Error 1
maker1: *** [samples/gpu/CMakeFiles/example_gpu_driver_api_multi.dir/all] Error 2
make: *** [all] Error 2