fedora 12, rebuild centos kernel and moblin kernel error

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I am working on Fedora 12. I tried rebuild CentOS and mobiln source kernel, but always failed by apply patch.

I build rpmbuild paths.

After installed kernel-<version>.src.rpm, I get into rpmbuild/SPEC and run "rpm -bp --target=`uname -m` kernel.spec", this will always failure at apply patch. And it happened with moblin kernel too.

But I can do the same thing with fedora kernel, and it will success.

Does any one meet the same problem? Does any one know why?

Thanks.