The package will work, if you have a RH/FC wxGTK 2.6 package installed. But there is no package for FC3, so I don't think that there is one for RHEL 4.
You will have to compile wxGTK too, if there is no wxGTK 2.6 package available. Try to use the src.rpm from FC4 (http://stentz.freshrpms.net/rpm.html?id=473) and compile it with
rpmbuild --rebuild wxGTK-2.6.2-0.2.2.fc4.src.rpm
Perhaps you will need to solve some dependencies.
I never tested this, so I can't say whether it really works (perhaps even solving the dependencies will fail because of different package names).
Good luck ;)
Daniel