For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:gcomes.obs:mcomix/openSUSE_Tumbleweed/home:gcomes.obs:mcomix.repo
zypper refresh
zypper install mcomix
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:gcomes.obs:mcomix/16.0/home:gcomes.obs:mcomix.repo
zypper refresh
zypper install mcomix
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:gcomes.obs:mcomix/15.6/home:gcomes.obs:mcomix.repo
zypper refresh
zypper install mcomix