dh_testroot - ensure that a package is built as root
       dh_testroot [debhelperoptions]
       dh_testroot simply checks to see if you are root. If not, it exits with
       an error. Debian packages must be built as root, though you can use
       fakeroot(1)
       debhelper(7)
       This program is a part of debhelper.
       Joey Hess <joeyh@debian.org>