the link with installation scripts (PKGBUILD)  for Arch Linux  is dead and I guess has been dead for about a month now, since the Arch User Repositories (AUR) has been moved to a git-based backend  and the kwant-related packages have not been moved. I took the PKGBUILD files for tinyarray and kwant from a mirror  and updated them. They build on my system, but any comments before I reupload them to the AUR are greatly appreciated. You can find the new PKGBUILD files attached.
best regards, Jörg Behrmann
 https://aur.archlinux.org/packages/python2-kwant/  http://kwant-project.org/install#arch-linux  https://lists.archlinux.org/pipermail/aur-general/2015-June/030724.html  https://github.com/aur-archive/python2-tinyarray and https://github.com/aur-archive/python2-kwant/