The current eternal-lands ebuild (1.3.0-r1) is dependent on the old cal3d-0.10.0 library; cal3d-0.11.0 is the latest stable version. I changed the ebuild dependency to ">=media-libs/cal3d-0.10.0", and it compiled successfully; a quick test showed that it ran without obvious problems (on amd64.) I'd appreciate feedback from other platforms, but I'd say it's good enough for ~amd64.
In portage. thanks for the bug report.
It does not work with the 0.11 snapshot that is still in portage - I've changed the deps for either 0.10 or 0.11.