simdock 1.2-8 is not built with $RPM_OPT_FLAGS. Maybe because of the autogen.sh call which was added in -8 (it calls ./configure without options at the end)? http://kojipkgs.fedoraproject.org/packages/simdock/1.2/8.fc13/data/logs/x86_64/build.log
Thanks for report Ville, fixed in -9: http://koji.fedoraproject.org/koji/getfile?taskID=1997593&name=build.log http://koji.fedoraproject.org/koji/buildinfo?buildID=157313
simdock-1.2-9.fc13 has been submitted as an update for Fedora 13. http://admin.fedoraproject.org/updates/simdock-1.2-9.fc13
simdock-1.2-9.fc13 has been pushed to the Fedora 13 stable repository. If problems still persist, please make note of it in this bug report.