For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:belphegor_belbel:KDE3:others/openSUSE_Tumbleweed/home:belphegor_belbel:KDE3:others.repo
zypper refresh
zypper install libdar4
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:belphegor_belbel:KDE3:others/16.0/home:belphegor_belbel:KDE3:others.repo
zypper refresh
zypper install libdar4
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:belphegor_belbel:KDE3:others/15.6/home:belphegor_belbel:KDE3:others.repo
zypper refresh
zypper install libdar4