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After installing, you'll have an
xmonad binary on your system. From there, you'll need to wire xmonad up to your login manager.
$ pacman -S xmonad # for the core package $ pacman -S xmonad-contrib # for the contrib package
See xmonad on ArchWiki for more info.
$ apt-get install xmonad # for the xmonad binary $ apt-get install libghc6-xmonad-dev # to allow configuration through xmonad.hs $ apt-get install libghc6-xmonad-contrib-dev # for all of the contrib modules
Note: On Hardy Heron and earlier, the libghc6-x11-dev package was compiled without Xinerama support. This means that if you want multi-monitor support, you will either need to upgrade to Intrepid Ibez or compile xmonad (and the Haskell X11 library on which it depends) from tarball.