Specifically for Firefox 32bit plugins, another option is to install
nspluginwrapper
(http://gwenole.beauchesne.info/projects/nspluginwrapper/ ) that allows
running 32 bit plugins under Firefox 64 bit. Its probably not available
for CentOS4 (I haven't even bothered to check), but there is a source
RPM from the site above that you can use.

For other 32 bit software, CentOS does not package all 32 bit packages
for x86_64 - only the really important stuff (do they offer
mplayerplug-in in their 32bit repositories ? I'm not sure), but you can
always add another repository that points directly to the 32 bit
release:

Go to /etc/yum.repos.d
locate the CentOS repository file (probably called centos.repo or
something)
copy it to another file, let's call it centos-i386.repo
open the new file for editing and replace every instance of $arch with
i386. 
save and enjoy.

On Tue, 2008-01-29 at 12:00 +0200, Tom Rosenfeld wrote:
> You guys have been so helpful, here is another yummy question. :-)
> 
> I am running CentOS 4 64 bit, but sometimes i need to install 32 bit
> binaries.
> For example firefox, so that plugins work.
> 
> Sometimes when I append ".386" in my yum install commands it works and
> finds the 32 bit version.
> However, often it does not. For example:
>    yum install  mplayerplug-in.i386
> replies 
>    No Match for argument: mplayerplug-in.i386
> However we all know that mplayerplug-in.i386 does exist, but only in
> 32 bit repositories. Yum replaces $arch with x86_64 even when I
> explicitly ask for .i386.
> 
> Any suggestions on how to get around this?
> 
> Thanks,
> -- 
> -tom
> 054-244-8025
-- 

Oded


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