Для openSUSE Tumbleweed запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:agraf/openSUSE_Tumbleweed/home:agraf.repo
zypper refresh
zypper install libtorrent
Для 16.0 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:agraf/16.0/home:agraf.repo
zypper refresh
zypper install libtorrent
Для 15.6 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:agraf/15.6/home:agraf.repo
zypper refresh
zypper install libtorrent
Для 15.5 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:agraf/15.5/home:agraf.repo
zypper refresh
zypper install libtorrent