Para openSUSE Tumbleweed execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:michals/openSUSE_Tumbleweed/home:michals.repo
zypper refresh
zypper install flex
Para openSUSE Factory PowerPC execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:michals/openSUSE_Factory_PowerPC/home:michals.repo
zypper refresh
zypper install flex
Para openSUSE Factory ARM execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:michals/openSUSE_Factory_ARM/home:michals.repo
zypper refresh
zypper install flex
Para 16.0 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:michals/16.0/home:michals.repo
zypper refresh
zypper install flex