Do you mind trying it again, and before you start the installer do a % sudo pacman -Sy and see if all repositories are loading up and updating.
It seems as the installer run without updating all repositories. The pkgs that you are showing are all picked up from arch like the obarun repositories are not there. Unless you have altered pacman manually.
All the packages listed when I check, like hwlock should come from obextra, not extra. What image are you using to do the installation?
% sudo pacman -Si hwloc
Repository : obextra
Name : hwloc
Version : 2.1.0-2
Description : Portable Hardware Locality is a portable abstraction of hierarchical architectures
Architecture : x86_64
URL : https://www.open-mpi.org/projects/hwloc/
Depends On : libtool libpciaccess