Quelle: man rpmbuildREBUILD AND RECOMPILE OPTIONS
There are two other ways to invoke building with rpm:
rpmbuild --rebuild|--recompile SOURCEPKG ...
When invoked this way, rpmbuild installs the named source package, and does a prep, compile and install. In addition, --rebuild builds a new binary package. When the build has completed, the build directory is removed (as in --clean) and the the sources and spec file for the package are removed.