需要 openSUSE Tumbleweed ，用 root 執行：
zypper addrepo https://download.opensuse.org/repositories/openSUSE:infrastructure:MirrorCache/openSUSE_Tumbleweed/openSUSE:infrastructure:MirrorCache.repo
zypper refresh
zypper install perl-Math-Int64
需要 16.0 ，用 root 執行：
zypper addrepo https://download.opensuse.org/repositories/openSUSE:infrastructure:MirrorCache/16.0/openSUSE:infrastructure:MirrorCache.repo
zypper refresh
zypper install perl-Math-Int64
需要 15.7 ，用 root 執行：
zypper addrepo https://download.opensuse.org/repositories/openSUSE:infrastructure:MirrorCache/15.7/openSUSE:infrastructure:MirrorCache.repo
zypper refresh
zypper install perl-Math-Int64
需要 15.6 ，用 root 執行：
zypper addrepo https://download.opensuse.org/repositories/openSUSE:infrastructure:MirrorCache/15.6/openSUSE:infrastructure:MirrorCache.repo
zypper refresh
zypper install perl-Math-Int64
需要 15.5 ，用 root 執行：
zypper addrepo https://download.opensuse.org/repositories/openSUSE:infrastructure:MirrorCache/15.5/openSUSE:infrastructure:MirrorCache.repo
zypper refresh
zypper install perl-Math-Int64