Para 15.6 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:neotinker3:ROS:ROS1:noetic:external_dependencies:testing/15.6/home:neotinker3:ROS:ROS1:noetic:external_dependencies:testing.repo
zypper refresh
zypper install eigen3
Para 15.5 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:neotinker3:ROS:ROS1:noetic:external_dependencies:testing/15.5/home:neotinker3:ROS:ROS1:noetic:external_dependencies:testing.repo
zypper refresh
zypper install eigen3
Para 15.3 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:neotinker3:ROS:ROS1:noetic:external_dependencies:testing/15.3/home:neotinker3:ROS:ROS1:noetic:external_dependencies:testing.repo
zypper refresh
zypper install eigen3