Comment #9 on issue 350 by vogt.adam: Investigate using Dyre for xmonad configuration http://code.google.com/p/xmonad/issues/detail?id=350 This may or may not belong to dyre's responsibility, but it would be nice to specify that the xmonad.hs is compiled using the correct -package. If Cabal permits, ghc's package names could include those hashes, so multiple xmonad-0.9.2 could coexist (ex. global and user). Confusion resulting from unexpected results from multiple xmonad installs happens often in #xmonad. After a compile failure with restricted package versions fails, a second attempt should be made without the -hide-all-packages. That way multiple versions of xmonad could coexist for a single user, and it may make install errors clearer. The only downside I see is excessive code complexity. Haskell is more consise than my current description and some parts may be in dyre, so it might be worthwhile.