Cuda library error

I am trying to run a code but I am unable to create the executable. When I build it using :
g++ -O main.cpp pkg-config opencv --cflags --libs -l argtable2 -o harrisblk

I am getting an error:
/usr/bin/ld: cannot find -lcufft
/usr/bin/ld: cannot find -lnpps
/usr/bin/ld: cannot find -lnppi
/usr/bin/ld: cannot find -lnppc
/usr/bin/ld: cannot find -lcudart
collect2: error: ld returned 1 exit status

I am guessing these are cuda related libraries.

Any help is greatly appreciated.
Thanks

It got solved by using this -L/usr/local/cuda-6.5/lib