I used this PKGBUILD: https://aur.archlinux.org/packages/kodi ... r-hts-git/
You've got to ' fix' the "depends" line (e.g. remove it) if you've got kodi-rbp installed. You could also copy the compile flags from the kodi-rbp PKGBUILD file, but I couldn't see any difference if you don't do this.
Currently this only works with 15.0. The combination with Kodi 15.1 doesn't work (core dumps)
Look in your cache if you've already upgraded to 15.1 ( pacman -U /var/cache/pacman/pkg/kodi-rbp-15.0-2-armv7h.pkg.tar.xz ).
I've also an backup if it's not in your cache