Assuming you installed CUDA 6.5 via runfile (not RPM or DEB), and your top-level
installation exists at /usr/local/cuda-6.5, the following commands should work:

$ cp cusolver_patch_linux_runfile_installation.tar.gz ~
$ cd /usr/local/cuda-6.5
$ sudo tar zxvf ~/cusolver_patch_linux_runfile_installation.tar.gz

This will update the cusolver libraries inside
/usr/local/cuda-6.5/lib64

and the include files inside
/usr/local/cuda-6.5/include