For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Documentation/openSUSE_Tumbleweed/Documentation.repo
zypper refresh
zypper install man-pages-posix
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Documentation/openSUSE_Factory_ARM/Documentation.repo
zypper refresh
zypper install man-pages-posix
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Documentation/openSUSE_Factory/Documentation.repo
zypper refresh
zypper install man-pages-posix
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Documentation/15.6/Documentation.repo
zypper refresh
zypper install man-pages-posix
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Documentation/15.5/Documentation.repo
zypper refresh
zypper install man-pages-posix