[Fedora-packaging] rpm and backward compatibility

Hi, I've just installed F12 and now can't generate rpms that work on older (FC6, in this case) distros. The problem is the payload compression: error: Failed dependencies: rpmlib(PayloadIsXz) <= 5.2-1 is needed by ...... This appears to be caused by a change in the compression library. Google suggests that the older algorithm can be selected with something like: %_binary_payload w2.lzdio to the spec file When building I get: error: line 22: Unknown tag: w2.xzdio w2.lzdio What would be the correct syntax? Thanks. -- Regards, Ian Leonard