FabioLolix [1] filed a request to merge eigen3-hg [2] into eigen-git [3]: eigen development moved to git, it is still in the 3.x branch making this pkgbuild an outdated duplicate
[1] https://aur.archlinux.org/account/FabioLolix/ [2] https://aur.archlinux.org/pkgbase/eigen3-hg/ [3] https://aur.archlinux.org/pkgbase/eigen-git/
