required glibc-common = 2.12-1.25.el6 vs installed glibc-common-2.12-1.25.el6_1.3.x86_64

I'm not sure if this is a yum issue or just me being a bit brain dead.

I'm trying to install gcc on a Scientific Linux release 6.1 (Carbon) box
using yum but it keeps giving me the following error.

Error: Package: glibc-2.12-1.25.el6.i686 (sl)
           Requires: glibc-common = 2.12-1.25.el6
           Installed: glibc-common-2.12-1.25.el6_1.3.x86_64 (@sl-fastbugs/6)
               glibc-common = 2.12-1.25.el6_1.3
           Available: glibc-common-2.12-1.25.el6.x86_64 (sl)
               glibc-common = 2.12-1.25.el6

Anyone else having this problem, or know of how to fix it?

Thanks
Terre

# yum clean all
Loaded plugins: refresh-packagekit
Cleaning repos: sl sl-security
Cleaning up Everything

# yum install gcc
Loaded plugins: refresh-packagekit
sl
| 3.2 kB     00:00
sl/primary_db
| 4.0 MB     00:04
sl-security
| 1.9 kB     00:00
sl-security/primary_db
| 2.4 MB     00:02
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package gcc.x86_64 0:4.4.5-6.el6 will be installed
--> Processing Dependency: cpp = 4.4.5-6.el6 for package:
gcc-4.4.5-6.el6.x86_64
--> Processing Dependency: cloog-ppl >= 0.15 for package:
gcc-4.4.5-6.el6.x86_64
--> Processing Dependency: glibc-devel >= 2.2.90-12 for package:
gcc-4.4.5-6.el6.x86_64
--> Running transaction check
---> Package cloog-ppl.x86_64 0:0.15.7-1.2.el6 will be installed
--> Processing Dependency: libppl.so.7()(64bit) for package:
cloog-ppl-0.15.7-1.2.el6.x86_64
--> Processing Dependency: libppl_c.so.2()(64bit) for package:
cloog-ppl-0.15.7-1.2.el6.x86_64
---> Package cpp.x86_64 0:4.4.5-6.el6 will be installed
--> Processing Dependency: libmpfr.so.1()(64bit) for package:
cpp-4.4.5-6.el6.x86_64
---> Package glibc-devel.x86_64 0:2.12-1.25.el6 will be installed
--> Processing Dependency: glibc-headers = 2.12-1.25.el6 for package:
glibc-devel-2.12-1.25.el6.x86_64
--> Processing Dependency: glibc = 2.12-1.25.el6 for package:
glibc-devel-2.12-1.25.el6.x86_64
--> Processing Dependency: glibc-headers for package:
glibc-devel-2.12-1.25.el6.x86_64
--> Running transaction check
---> Package glibc.i686 0:2.12-1.25.el6 will be installed
--> Processing Dependency: glibc-common = 2.12-1.25.el6 for package:
glibc-2.12-1.25.el6.i686
--> Processing Dependency: libfreebl3.so(NSSRAWHASH_3.12.3) for package:
glibc-2.12-1.25.el6.i686
--> Processing Dependency: libfreebl3.so for package:
glibc-2.12-1.25.el6.i686
---> Package glibc-headers.x86_64 0:2.12-1.25.el6 will be installed
--> Processing Dependency: kernel-headers >= 2.2.1 for package:
glibc-headers-2.12-1.25.el6.x86_64
--> Processing Dependency: kernel-headers for package:
glibc-headers-2.12-1.25.el6.x86_64
---> Package mpfr.x86_64 0:2.4.1-6.el6 will be installed
---> Package ppl.x86_64 0:0.10.2-11.el6 will be installed
--> Running transaction check
---> Package glibc.i686 0:2.12-1.25.el6 will be installed
--> Processing Dependency: glibc-common = 2.12-1.25.el6 for package:
glibc-2.12-1.25.el6.i686
---> Package kernel-headers.x86_64 0:2.6.32-131.17.1.el6 will be installed
---> Package nss-softokn-freebl.i686 0:3.12.9-3.el6 will be installed
--> Finished Dependency Resolution
Error: Package: glibc-2.12-1.25.el6.i686 (sl)
           Requires: glibc-common = 2.12-1.25.el6
           Installed: glibc-common-2.12-1.25.el6_1.3.x86_64 (@sl-fastbugs/6)
               glibc-common = 2.12-1.25.el6_1.3
           Available: glibc-common-2.12-1.25.el6.x86_64 (sl)
               glibc-common = 2.12-1.25.el6
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest