An X11 version of CB would be useful, absolutely.
I don't have a standalone version, mainly because I didn't feel like
compiling GTK+ and all of the requirements. However, it is possibly
to build one using DarwinPorts, and a local Portfile repository...
On the Wiki are the files you need, first you build "wxGTK" in
graphics/wxGTK (you need to uninstall the usual "wxWidgets")
and then you build C::B in devel/codeblocks, without wxMac.
Once set up, it's something like:
sudo port install wxGTK
sudo port install codeblocks +puredarwin-macosx