On a CentOS 6.3 VM, the install of libgcc_s.so.1 failed with "Error: 
Protected multilib versions: libgcc-4.4.7-3.el6.i686 != 
libgcc-4.4.6-4.el6.x86_64". Therefore it didn't go on to next install of 
libaio.so.1 and libncurses.so.5; easily fixed by splitting the install 
into tw separate commands.