Yum --exclude does not work??

Hi,

I am having a issue while doing a yum update
I am using Centos 5.2 and yum details are as follows

> 3.2.19
>   Installed: yum-metadata-parser-1.1.2-2.el5.i386 at 2008-12-02 08:59
>   Built    : [] at 2008-05-24 19:53
>   Committed: James Antill <[email protected]> at 2008-01-18 22:00
>
>   Installed: rpm-4.4.2.3-9.el5.i386 at 2009-04-17 09:00
>   Built    : [] at 2009-01-21 08:05
>   Committed: Panu Matilainen <[email protected]> at 2008-12-02 22:00
>
>   Installed: yum-3.2.19-18.el5.centos.noarch at 2009-04-17 08:53
>   Built    : [] at 2009-01-22 10:53
>   Committed: Karanbir Singh <[email protected]> at 2009-01-22 22:00
>

It gives

> ffmpeg-20081216-1.i386 from installed has depsolving problems
>   --> Missing Dependency: libbfd-2.17.50.0.6-6.el5.so is needed by package
> ffmpeg-20081216-1.i386 (installed)
> lame-398-2-1.i386 from installed has depsolving problems
>   --> Missing Dependency: libbfd-2.17.50.0.6-6.el5.so is needed by package
> lame-398-2-1.i386 (installed)
> Error: Missing Dependency: libbfd-2.17.50.0.6-6.el5.so is needed by
> package lame-398-2-1.i386 (installed)
> Error: Missing Dependency: libbfd-2.17.50.0.6-6.el5.so is needed by
> package ffmpeg-20081216-1.i386 (installed)
>
The packages ffmpeg and lam-398 were custom compiled with some
modifications.
These packages with the modification are in use for a live site hosted on
the machine.
I also did a *--exclude=lame* --exclude=ffmpeg* *but it gives the same error
while yum updating (even tried excluding in yum.conf).
I did a google search, which told that i should *rpm -e --nodeps* the
conflicting package?
Since, that cannot be done can anyone suggest a workaround for updating
Centos using yum?

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