[Freesurfer] a question about VirtualBoxFS4.5

Hi, there,

I am using VirtualBox45 now. After I installed it, I tested it using tkmedit and tksurfer command, everything looks ok. However, when I try to run a recon-all command, it fails at the mris_volmask step, the error mask I got is:

"mris_volmask.bin: error while loading shared libraries: libtiff.so.3: cannot open shared object file: No such file or directory"

As someone suggested in the mailing list, I tried to make a symbolic link or a soft link named libtiff.so.3 which points to libtiff.so.4 using the following command: ln /usr/lib/libtiff.so.4 /usr/lib/libtiff.so.3 ln -sf /usr/lib/libtiff.so.4 /usr/lib/libtiff.so.3

But all of them gave me an error message: Permission denied.

Does anyone can help?

Thanks a lot! Guang