Step4: ./debian/rules install

root権限で実行 
debian/tmp 以下にインストール

 % fakeroot ./debian/rules install

  install: build
        dh_testdir
        dh_testroot
        dh_clean -k
        dh_installdirs
        # Add here commands to install the package into debian/tmp.
        $(MAKE) install prefix=`pwd`/debian/tmp/usr