[root@localhost satikas]# rpmbuild -ta '/home/satikas/Töölaud/misiganes.tar.gz'
error: Name field must be present in package: (main package)
error: Version field must be present in package: (main package)
error: Release field must be present in package: (main package)
error: Summary field must be present in package: (main package)
error: Group field must be present in package: (main package)
error: License field must be present in package: (main package)
[root@localhost satikas]#

-bp                           build through %prep (unpack sources and apply
                                patches) from <specfile>
  -bc                           build through %build (%prep, then compile)
                                from <specfile>
  -bi                           build through %install (%prep, %build, then
                                install) from <specfile>
  -bl                           verify %files section from <specfile>
  -ba                           build source and binary packages from
                                <specfile>
  -bb                           build binary package only from <specfile>
  -bs                           build source package only from <specfile>

-ta                           build source and binary packages from <tarball>
  -tb                           build binary package only from <tarball>
  -ts                           build source package only from <tarball>