I dont seem to be able to install devtoolset-3 on an sl6x x86_64 system.
I've done it successfully with devtoolset-2 on an i686 system.  My
procedure is

1. Wget the yum-conf-devtoolset rpm and install it.

2. Then, when I do a

       # yum --enablerepo=devtoolset install devtoolset-3-toolchain

it just comes back and says no such available package.  Though the
package is listed clear as day on the mirror.


I've tried this on 2 different systems and the result is the same.  I'm
baffled.  What am I missing?

Thanks.