[yt-users] yt doesn't see some libraries

Dear yt users, I have the following problem with my yt installation: when I start ipython or iyt I get the following message: WARNING: Readline services not available on this platform. WARNING: The auto-indent feature requires the readline library and so many useful features (like tab-completion) don't work. I have another Python installation on my machine, and there it all works and does not have this warning. I can bear with the annoying editing, but now I wanted to use the sqlite3 library, and it is the same - it works from the other Python installation, but not from the one within yt. How do I tell the yt installation where to look for these libraries? Thanks for your help, Irina