Para openSUSE Tumbleweed corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:ecsos/openSUSE_Tumbleweed/home:ecsos.repo
zypper refresh
zypper install gtk2-engine-oxygen
Para openSUSE Slowroll corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:ecsos/openSUSE_Slowroll/home:ecsos.repo
zypper refresh
zypper install gtk2-engine-oxygen
Para 16.0 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:ecsos/16.0/home:ecsos.repo
zypper refresh
zypper install gtk2-engine-oxygen