Your best shot might be to download it from an old, outdated repository of whatever ditribution you're using. For instance, if you're using redhat/fedora, instead of version FC4, you might find it in version 5.2 or something similar. As it's a library, you shouldn't face too many dependancy problems. Even if your distribution is fairly new, it's likely based on another, older distribution, and you might be able to use the older distribution's version. All else fails, if a library is really old and crusty, any version that you can unpack (slackware would be a good suggestion, as it's usually unencumbered by a lot of distro-specific fluff) might do the trick. Of course, you might have to massage it a little to get it to work correctly (editting paths, modifiying Y-windows config files, or jogging around directory names, etc.), but with a little effort, it should work alright.
Ibiblio is usually a good repository for older items, as it's been around a long time:
ftp://ftp.ibiblio.org/pub
