For openSUSE Factory PowerPC run the following as root:
zypper addrepo https://download.opensuse.org/repositories/utilities/openSUSE_Factory_PowerPC/utilities.repo
zypper refresh
zypper install ncdu
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/utilities/openSUSE_Factory_ARM/utilities.repo
zypper refresh
zypper install ncdu
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/utilities/openSUSE_Factory/utilities.repo
zypper refresh
zypper install ncdu
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/utilities/15.5/utilities.repo
zypper refresh
zypper install ncdu
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/utilities/15.4/utilities.repo
zypper refresh
zypper install ncdu