ntop-3.0 contains a sandbox violation error on the following files / dirs: chown: /var/lib/ntop chown: /var/lib/ntop/.keep In the ebuild, there's a line: chown -R nobody:nobody /var/lib/ntop I think that has to be: chown -R nobody:nobody ${D}/var/lib/ntop
thanks for the catch. fixed in portage.