I'm running Centos 6.3 x64. I used the linc-1.0.3-1.x86_64.rpm in the SDII tar ball because of the missing liblinc.so.1 library. Superdoctor appears to work in text only mode, but generates the segmentation fault when just running as SuperDoctor, which I assume produces a graphical window. (16219)
There is a problem in libxcb-1.8.1-1.e16.i686.
Please try to use libxcb-1.7-1.fc14.i686.rpm.
(Ref. http://rpmfind.net/linux/rpm2html/search.php?query=libxcb.so.1)