I am having identical problems trying to install apt and similar problems trying to install most anything else from binary rpms.
The rpm i have tried is identical to the one mentioned in the previous post by Dapper Dan.
The curious thing is that lib-4.3.so, librpmdb-4.3.so and librpmio-4.3.so are all present on my computer, so i do not understand why i am told by the package manager that they are not.
Most anything else i try to install from rpms made to fit fc3 provide similar results: The package manager tells me about missing dependencies, but the files mentioned are actually present and therefore should not cause any problems.
I have suspicions that the problems are caused by a bug in up2date, which i have used extensively to update my system, but i am not yet sure of this.
Please help.