FC5下安装fvwm遇到问题

sentven

在FC5（2.6.16-1.2080_FC5）下安装fvwm(fvwm-2.4.15)时遇到问题
＃./configure
它提示:checking for X... no

X11 libraries or header files could not be found. Please make
sure the X11 development package is installed on your system.
If it is definitely installed, try setting the include and library
paths with the --x-include and --x-libraries options of configure.
Fvwm can not be compiled without the X11 development environment

Aborting.

可是我记得在安装FC5的时候已经装了X Window的
另外有个问题，FC5的X Window是不是XFree86?
但是我的系统的/usr/X11R6目录基本上是空的

之前安装fvwm的rpm包，提示少了xorg-x11-libs包，我用yum下载却下不到这个包
是不是我的yum设置有问题，还是FC5里根本就没这个包了？
我去网站上找也只找到FC4版本的