For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:misc/openSUSE_Tumbleweed/devel:languages:misc.repo
zypper refresh
zypper install chicken
For openSUSE Leap 15.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:misc/openSUSE_Leap_15.2/devel:languages:misc.repo
zypper refresh
zypper install chicken
For openSUSE Leap 15.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:misc/openSUSE_Leap_15.1/devel:languages:misc.repo
zypper refresh
zypper install chicken
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:misc/openSUSE_Factory/devel:languages:misc.repo
zypper refresh
zypper install chicken