For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:dnh/openSUSE_Tumbleweed/home:dnh.repo
zypper refresh
zypper install mc
For openSUSE 12.1 Update standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:dnh/openSUSE_12.1_Update_standard/home:dnh.repo
zypper refresh
zypper install mc
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:dnh/15.4/home:dnh.repo
zypper refresh
zypper install mc