This contains a PKGBUILD file to build a package for Arch Linux from the latest release in a the same way as packages in the AUR https://wiki.archlinux.org/index.php/Arch_User_Repository .
Clone this repository and cd into it:
$ git clone https://github.com/boutproject/arch-bout-git.git
$ cd arch-bout-git
then run makepkg to fetch, compile and install BOUT++.
$ makepkg -si
This should also make sure that the dependencies are installed.
After installation you should be able to run bout-config,
which can be used to find BOUT++ components and build examples.
Some more information is in the BOUT++ user manual: