You can install the Psi+ package using pacman, yaourt or build the package from sources.

• Download latest pkg.tar.gz package file for ArchLinux from the Psi+ Download page.

• Install the package as root:

pacman -U your_package_file

You have also to install all dependencies that are required by the Psi+ package.

You may install Psi+ from AUR as root:

yaourt -S psi-plus-svn

For this method you need a PKGBUILD file to build the package from source and the makepkg utility.

• Download PKGBUILD file from here.
• Use makepkg to build the package.

Create a directory for building Psi+. The build session may look like this:

cd ~                   # change the current dir to $HOME
mkdir psi-plus         # create a new directory
cd psi-plus            # enter it
wget http://psi-dev.googlecode.com/files/PKGBUILD   # or manually put the PKGBUILD file in this directory instead
makepkg -i -s          # build the package, download all the dependences
                       # and install as root automatically

You can run makepkg without any parameters.

Then your package file will be created in current directory (or in directory specified with PKGDEST variable in your /etc/makepkg.conf file). You also have to install all dependences manually with the pacman utility.

After building you can install your package using pacman -U package_file.pkg.tar.gz command as root.

NOTE: to save traffic don't delete the directory (~/psi-plus) and its content, next time you will run the makepkg utility it will download 'only a minimal' amount of data from the svn and git Psi+ source servers.