There are new packages for Fedora Core 2 here: http://den.tourinfo.ru/pack/d4x/Fedora2/
Never heard of this program before you mentioned it but took a quickThis (d4x) is on FreshRPMs for FC1, so might well end up being available APT-able for FC2 soon. Maybe that will solve the prob if the src.rpm route doesn't work out. I'm waiting for it myself.
look. They only have a FC1 version that does give the error you mention.
If you have development tools installed on your system you can grab the source rpm from:
and use this command to rebuild a new installable rpm that should work on FC2:
rpmbuild --rebuild d4x-2.5.0rc3-1.src.rpm