对于 15.6，请以根用户 root 运行下面命令：
zypper addrepo https://download.opensuse.org/repositories/spins:invis:15:unstable:samba/15.6/spins:invis:15:unstable:samba.repo
zypper refresh
zypper install flex
对于 15.5，请以根用户 root 运行下面命令：
zypper addrepo https://download.opensuse.org/repositories/spins:invis:15:unstable:samba/15.5/spins:invis:15:unstable:samba.repo
zypper refresh
zypper install flex
对于 15.4，请以根用户 root 运行下面命令：
zypper addrepo https://download.opensuse.org/repositories/spins:invis:15:unstable:samba/15.4/spins:invis:15:unstable:samba.repo
zypper refresh
zypper install flex