Issue 81: X11-1.3.0 won't build on OSX 10.4 without altering X11.cabal to point to /usr/X11R6/lib http://code.google.com/p/xmonad/issues/detail?id=81 Comment #2 by hitesh.jasani: Setting the LD_LIBRARY_PATH is another workaround, but workarounds shouldn't be necessary. During the configure step, Cabal figures out where the X includes and libraries are located, but then proceeds to forget the lib location during the build. % runghc Setup.hs configure ... checking for X... libraries /usr/X11R6/lib, headers /usr/X11R6/include ... -- You received this message because you are listed in the owner or CC fields of this issue, or because you starred this issue. You may adjust your issue notification preferences at: http://code.google.com/hosting/settings