I'm trying to add an audiobook to my iPod using gtkpod. I keep getting an error message saying that I need to install the mp4v2 libraries. I tried installing gtkpod-aac, as suggested in a post I found while trying to solve this, but that didn't help. I tried compiling the mp4v2 library from source, but I'm still getting the same message. I don't know what else to do. Can anyone help me figure this out?