MarsSeed [1] filed a request to merge lammps-beta [2] into lammps-git [3]: The beta pkg is broken and has been unmaintained for close to 3 years.
Better to keep only the -git package (and there's also a maintained stable AUR/lammps build). [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/lammps-beta/ [3] https://aur.archlinux.org/pkgbase/lammps-git/
