Для openSUSE Tumbleweed запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:michals:mingw/openSUSE_Tumbleweed/home:michals:mingw.repo
zypper refresh
zypper install mingw64-cross-cmake
Для 16.0 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:michals:mingw/16.0/home:michals:mingw.repo
zypper refresh
zypper install mingw64-cross-cmake
Для 15.6 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:michals:mingw/15.6/home:michals:mingw.repo
zypper refresh
zypper install mingw64-cross-cmake