Where to get X window Libraries?

Hey,

I'm trying to install fluxbox. Currently i'm running Mandrake 10.1 with KDE. When i ./configure fluxbox it returns an error saying

configure: error: Fluxbox requires the X Window System libraries and headers.

Where do i download the X window System libraries and headers from? I have looked but i'm not to sure if i've got the right files downloaded. And if i am using another window manager can i switch between fluxbox and KDE if i have to?

Thanks
Byblyk

I'm sure you can get them from Mandrake. Search for Xorg or Xfree86, not sure which Mandrake uses now.

install xorg-x11-devel package

Thanks guys, i know i needed some kind of devel packages but i was unsure of which i needed, that cleared things up nicley. Thanks and i'm surre i'll get her working in no time now.