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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.
$ emerge xmonad-contrib # the contrib package depends on xmonad so it gets also installed
if you only want to install xmonad without contrib you could use: $ emerge xmonad
$ apt-get install libghc6-xmonad-contrib-dev # for all of xmonad core and xmonad-contrib
$ apt-get install libghc6-xmonad-dev # for just xmonad core
$ apt-get install xmonad # for just the xmonad binary, without the ability to configure
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 install xmonad (and the Haskell X11 library on which it depends) through one of the #Generic options.
xmonad is in the ports tree. To install it,
sudo pkg_add xmonad
Mac OS X
xmonad can be installed from source on any system with an up-to-date Haskell toolchain:
$ cabal install xmonad