smokeqt 4.9.90-1 is not built with $RPM_OPT_FLAGS: http://kojipkgs.fedoraproject.org/packages/smokeqt/4.9.90/1.fc19/data/logs/x86_64/build.log 4.9.4-1 doesn't have this problem: http://kojipkgs.fedoraproject.org/packages/smokeqt/4.9.4/1.fc18/data/logs/x86_64/build.log
https://bugs.kde.org/show_bug.cgi?id=315772
Hrm, seems I totally missed seeing this bug until now. Fix looks good, thanks!
%changelog * Mon Feb 25 2013 Rex Dieter <rdieter> 4.10.0-2 - don't override CXXFLAGS (#884836, kde#315772)