And BTW, I don't have that library. So I don't remember if it was required by MEncoder which I also no longer have installed. I had replaced the hard drive on that desktop machine and installed a fresh RH73 install on it and never went to the trouble of reinstalling MEncoder.
I had installed it for a specific project and I no longer need it. I created MPG and AVI movies of a series of JPEG images for the project I did but it also works well for converting movies from one format to another. So basically all I am saying is I will not be of much help to you on specifics of installing. All I remember is that it was a terrific pain in the ass, but worth it.