Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 
RPM build errors:
error: Installed (but unpackaged) file(s) found:
   /usr/lib/systemd/system/polkit.service
    Installed (but unpackaged) file(s) found:
   /usr/lib/systemd/system/polkit.service
Error reported during packaging phase.