This is my first time posting here so i hope im doing this right. Just updated ghc to 7.10.1 and had to rebuild xmonad, xmonad-contrib, and xmobar. I also use xmonad-extras but it failed during the build. I tried using cabal and also from source but both give same output: $ cabal install xmonad-extras Resolving dependencies... Configuring xmonad-extras-0.12... Building xmonad-extras-0.12... Failed to install xmonad-extras-0.12 Build log ( /home/dvmacias/.cabal/logs/xmonad-extras-0.12.log ): Configuring xmonad-extras-0.12... Building xmonad-extras-0.12... Preprocessing library xmonad-extras-0.12... [1 of 2] Compiling XMonad.Util.WindowPropertiesRE ( XMonad/Util/WindowPropertiesRE.hs, dist/build/XMonad/Util/WindowPropertiesRE.o ) [2 of 2] Compiling XMonad.Actions.Volume ( XMonad/Actions/Volume.hs, dist/build/XMonad/Actions/Volume.o ) XMonad/Actions/Volume.hs:173:23: Ambiguous occurrence ‘<*’ It could refer to either ‘XMonad.Actions.Volume.<*’, defined at XMonad/Actions/Volume.hs:66:4 or ‘Prelude.<*’, imported from ‘Prelude’ at XMonad/Actions/Volume.hs:15:8-28 (and originally defined in ‘GHC.Base’) XMonad/Actions/Volume.hs:173:43: Ambiguous occurrence ‘<*’ It could refer to either ‘XMonad.Actions.Volume.<*’, defined at XMonad/Actions/Volume.hs:66:4 or ‘Prelude.<*’, imported from ‘Prelude’ at XMonad/Actions/Volume.hs:15:8-28 (and originally defined in ‘GHC.Base’) XMonad/Actions/Volume.hs:200:62: Ambiguous occurrence ‘<*’ It could refer to either ‘XMonad.Actions.Volume.<*’, defined at XMonad/Actions/Volume.hs:66:4 or ‘Prelude.<*’, imported from ‘Prelude’ at XMonad/Actions/Volume.hs:15:8-28 (and originally defined in ‘GHC.Base’) XMonad/Actions/Volume.hs:215:32: Ambiguous occurrence ‘<*’ It could refer to either ‘XMonad.Actions.Volume.<*’, defined at XMonad/Actions/Volume.hs:66:4 or ‘Prelude.<*’, imported from ‘Prelude’ at XMonad/Actions/Volume.hs:15:8-28 (and originally defined in ‘GHC.Base’) XMonad/Actions/Volume.hs:225:58: Ambiguous occurrence ‘<*’ It could refer to either ‘XMonad.Actions.Volume.<*’, defined at XMonad/Actions/Volume.hs:66:4 or ‘Prelude.<*’, imported from ‘Prelude’ at XMonad/Actions/Volume.hs:15:8-28 (and originally defined in ‘GHC.Base’) cabal: Error: some packages failed to install: xmonad-extras-0.12 failed during the building phase. The exception was: ExitFailure 1 I got to look at the log but it just has what i pasted above. System is Arch 3.19.2-1-ARCH Any input is appreciated. Thanks dave