Для standard запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:dirkmueller:Factory/standard/home:dirkmueller:Factory.repo
zypper refresh
zypper install libewf
Для p запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:dirkmueller:Factory/p/home:dirkmueller:Factory.repo
zypper refresh
zypper install libewf
Для 16.0 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:dirkmueller:Factory/16.0/home:dirkmueller:Factory.repo
zypper refresh
zypper install libewf