[Freesurfer] Error: cannot open libXss.so.1?

Dear Freesurfer, I ran recon-all with -all flag, and I've got an error message as below:

mris_volmask.bin: error while loading shared libraries: libXss.so.1: cannot

open shared object file: No such file or directory

Linux compute-0-1.local 2.6.18-92.1.13.el5PAE #1 SMP Wed Sep 24 20:07:49

EDT 2008 i686 i686 i386 GNU/Linux

recon-all exited with ERRORS at Tue Dec 8 07:43:35 KST 2009

I ran it on {Intel(R) Xeon(R) CPU E5345 @ 2.33GHz (4096 KB cache)} with {Linux compute-0-1.local 2.6.18-92.1.13.el5PAE #1 SMP Wed Sep 24 20:07:49 EDT 2008 i686 i686 i386 GNU/Linux}

I've googled it, only one case was posted via this mailing list. Yes, I want to know why this error occur but also how to fix it.

Please help me out here! 'A`

Mr. SG KIM.