[CentOS] gtk_scrollinglabel pacakage from pear.php.net not compile

I found this package that is a php class to scroll a message on screen 
with a gtk wrapper.
It wont compile on centos 4.2.

 http://pear.php.net/package/Gtk_ScrollingLabel

It gives me an error about not finding libglade-config
after much searching I found libglade-config and installed it.
THen I get an error about cant find xml-config....

Can someone who knows more than me help? Thanks if so...

Is this a normal process?
I would have hoped/thought that this would not be as difficult as this.

yum provides libglade-config
yum provides xml-config both return nothing found.

I'm stuck.

Jerry
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