[CentOS] kbs-CentOS Dependency Problems

There seem to be some inconsistencies in the kbs-CentOS repository:

[root at tabb1 ~]# yum update
Setting up Update Process
Setting up Repos
kbs-CentOS-Extras         100% |=========================|  951 B    00:00
kbs-CentOS-Misc           100% |=========================|  951 B    00:00
update                    100% |=========================|  951 B    00:00
base                      100% |=========================| 1.1 kB    00:00
centosplus                100% |=========================|  951 B    00:00
addons                    100% |=========================|  951 B    00:00
extras                    100% |=========================| 1.1 kB    00:00
Reading repository metadata in from local files
kbs-CentOS: ################################################## 1402/1402
kbs-CentOS: ################################################## 60/60
update    : ################################################## 116/116
base      : ################################################## 1406/1406
centosplus: ################################################## 81/81
extras    : ################################################## 32/32
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Package libcddb.i386 0:1.2.0-3.el4.kb set to be updated
---> Package ginac.i386 0:1.3.2-1.el4.kb set to be updated
--> Running transaction check
--> Processing Dependency: libcdio.so.5 for package: libcddb
--> Processing Dependency: libginac-1.3.so.0 for package: octave-forge
--> Processing Dependency: libcdio.so.5(CDIO_5) for package: libcddb
--> Finished Dependency Resolution
Error: Missing Dependency: libcdio.so.5 is needed by package libcddb
Error: Missing Dependency: libginac-1.3.so.0 is needed by package octave-forge
Error: Missing Dependency: libcdio.so.5(CDIO_5) is needed by package libcddb
[root at tabb1 ~]# rpm -q libcddb ginac libcdio octave-forge
libcddb-0.9.4-2
package ginac is not installed
libcdio-0.75-3.el4.kb
octave-forge-2004.11.16-8.el4.kb
[root at tabb1 ~]# rpm -q GiNaC
GiNaC-1.3.1-6.el4.kb

Would be glad to supply any additional information required to debug.
Any help appreciated.  [Given recent discussions, should mention that I
have used Dag, Dries, and ATrpms EL4 (but not FCx) repos but they don't
SEEM to be factors here.]

Thanks,
Phil