See also KWrite
It's easily modified.
I love the code folding. I can rig it to easily launch scripts.
Its features are used with KWrite as well.
Last tested 2.5.9 using KDE 3.5.9
Has Ruby syntax highlighting.
checking for X... configure: error: Can't find X includes. Please check your installation and add the correct paths!
x11-devel is installed. sigh) This was probably on PCLinuxOS 2007, and it can be re-tested..