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$ rpm -q nspluginwrapper nspluginwrapper-1.4.4-1.fc15.x86_64 $ rpm -q --qf %{description} nspluginwrapper|head -2 nspluginwrapper makes it possible to use Netscape 4 compatible plugins compiled for x86_64 into Mozilla for another architecture, e.g. x86_64. Uh? x86_64 = x86_64! [...] Spec file says: | ExclusiveArch: %{ix86} x86_64 ppc | | %description | nspluginwrapper makes it possible to use Netscape 4 compatible plugins | compiled for %{_arch} into Mozilla for another architecture, e.g. x86_64. This also makes the ppc build claim that it can use ppc plugins on x86_64.
Fixed in rawhide. And yes, ppc plugins can be run on x86_64, nspluginwrapper uses quemu for it (although it's not configured on Fedora).