最近需要装一个NCL的东西，以下是在安装帮助中找到的一句话，貌似需要X11 libraries，至少需要X11, Xaw, Xext, Xm, Xmu, Xt. 。请问这些东西在哪个目录下，或者需要安装么？
我使用的是RHEL5，安装时选择了全部的功能和软件。刚开始接触LINUX，多多指教！谢谢！
In order to build some of the X applications that are part of NCL (like idt), you must have some of the X11 libraries installed on your system. At a minimum, you should have the following libraries (and associated include files) installed on your system: X11, Xaw, Xext, Xm, Xmu, Xt.
