If you have a .src.rpm file, you can rebuild it on your local system using
rpmbuild --rebuild /tmp/mypackage-1.0.0-1.src.rpm
This will extrack the source files from the file and rebuild it using the instructions in the spec file.
If you have a .src.rpm file, you can rebuild it on your local system using
rpmbuild --rebuild /tmp/mypackage-1.0.0-1.src.rpm
This will extrack the source files from the file and rebuild it using the instructions in the spec file.