Para openSUSE Tumbleweed execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/X11:lxde/openSUSE_Tumbleweed/X11:lxde.repo
zypper refresh
zypper install libfm-doc
Para openSUSE Slowroll execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/X11:lxde/openSUSE_Slowroll/X11:lxde.repo
zypper refresh
zypper install libfm-doc
Para 16.0 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/X11:lxde/16.0/X11:lxde.repo
zypper refresh
zypper install libfm-doc