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: 
Checking for unpackaged file(s): /usr/lib/rpm/check-files /builddir/build/BUILD/git-lfs-3.6.1-build/BUILDROOT
error: Installed (but unpackaged) file(s) found:
   /usr/share/man/man7/git-lfs-faq.7.gz
    Installed (but unpackaged) file(s) found:
   /usr/share/man/man7/git-lfs-faq.7.gz
This snippet shows the cause of the build failure.