you could try using alien and debbootstrap to build a minimal up-to-date version of debian that runs in a chroot and build your login server in that. Probably wise to test on a non-critical system 1st though.
Once you have the server built, put it in a directory with the libraries it depends upon and use the LD_PRELOAD variable to force it to use the right libraries, so you don't have to use a chroot if you don't want to (I would run it in a chroot, to minimise the risk to business applications).
The old-school businessman part of me wonders why you'd build a game server on a system that has a "mission critical" role. Seems like a great way to piss off bosses/shareholders.
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