I'm running Caldera OpenLinux, or some other RPM-based Linux distribution, how do I get RPM packages?

Just because two distributions use RPMs doesn't mean they can use the same RPMs, for example, RedHat and Caldera use different versions of libc, so RedHat binary RPMs probably won't work on Caldera. One trick that might work is to take the SRPMS from the RedHat distribution, and use rpm --rebuild on them, and then install the resulting binary RPMs. Otherwise, you probably have to follow the tarball instructions.