Para openSUSE Tumbleweed corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:manfred-h:X11:xfce:4.21/openSUSE_Tumbleweed/home:manfred-h:X11:xfce:4.21.repo
zypper refresh
zypper install xfce4-panel
Para openSUSE Slowroll corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:manfred-h:X11:xfce:4.21/openSUSE_Slowroll/home:manfred-h:X11:xfce:4.21.repo
zypper refresh
zypper install xfce4-panel
Para 16.0 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:manfred-h:X11:xfce:4.21/16.0/home:manfred-h:X11:xfce:4.21.repo
zypper refresh
zypper install xfce4-panel
Para 15.6 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:manfred-h:X11:xfce:4.21/15.6/home:manfred-h:X11:xfce:4.21.repo
zypper refresh
zypper install xfce4-panel