It works now. It was a mistake from me. It was the wrong directory witch I used to start with the command "rpmbuild -ba lyx.spec"
I am ashamed of... How is it possible to give my RPM-Package called: "lyx-1.4.2-1_qt.i586.rpm" for Suse Linux 10.1 the community? It haves 5,8 MB Thank you xhosch