Para openSUSE Tumbleweed corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:mslacken:ml/openSUSE_Tumbleweed/home:mslacken:ml.repo
zypper refresh
zypper install antlr4
Para openSUSE Factory ARM corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:mslacken:ml/openSUSE_Factory_ARM/home:mslacken:ml.repo
zypper refresh
zypper install antlr4
Para 15.6 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:mslacken:ml/15.6/home:mslacken:ml.repo
zypper refresh
zypper install antlr4
Para 15.5 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:mslacken:ml/15.5/home:mslacken:ml.repo
zypper refresh
zypper install antlr4