Problem about installing X11

Dear NCL developers,

I'm trying to install NCL-6.0.0 on Red Hat Linux 5.3. When I installed X11
developer libraries and include files, none of the four commands which are
supplied by the INSTALL file can be used. The commands I've tried are

sudo apt-get install x11-dev

sudo apt-get install xorg-dev

sudo apt-get install libx11-dev

yum install libx11-devel

The computer suggests that

Loaded plugins: rhnplugin, security

This system is not registered with RHN.

RHN support will be disabled.

Setting up Install Process

Parsing package install arguments

No package libx11-devel available.

Nothing to do

Is that means that I should pay for it? I searched on the web to find out if
I can install X11 in another way, finding that I was still not sure about
the solutions.

Please help give me some suggestions to solve this problem. Thanks a lot.

Best,

Miao

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Received on Wed Nov 30 10:17:04 2011