Resolving dependencies...
Configuring mtl-2.2.1...
Configuring primitive-0.6.1.0...
Building mtl-2.2.1...
Building primitive-0.6.1.0...
Installed mtl-2.2.1
Configuring random-1.1...
Configuring text-1.2.2.1...
Installed primitive-0.6.1.0
Building random-1.1...
Building text-1.2.2.1...
Configuring utf8-string-1.0.1.1...
Installed random-1.1
Building utf8-string-1.0.1.1...
Installed utf8-string-1.0.1.1
Configuring vector-0.11.0.0...
Building vector-0.11.0.0...
Installed text-1.2.2.1
Configuring hashable-1.2.4.0...
Building hashable-1.2.4.0...
Installed hashable-1.2.4.0
Installed vector-0.11.0.0
Configuring hashtables-1.2.1.0...
Building hashtables-1.2.1.0...
Installed hashtables-1.2.1.0
Configuring gtk2hs-buildtools-0.13.2.1...
Building gtk2hs-buildtools-0.13.2.1...
Installed gtk2hs-buildtools-0.13.2.1
Configuring cairo-0.13.3.1...
Configuring glib-0.13.4.1...
Building cairo-0.13.3.1...
Building glib-0.13.4.1...
Installed cairo-0.13.3.1
Installed glib-0.13.4.1
Configuring gconf-0.13.1.0...
Configuring pango-0.13.3.1...
Building gconf-0.13.1.0...
Building pango-0.13.3.1...
Configuring gio-0.13.3.1...
Installed gconf-0.13.1.0
Building gio-0.13.3.1...
Installed pango-0.13.3.1
Installed gio-0.13.3.1
Configuring gtk-0.14.6...
Building gtk-0.14.6...
Installed gtk-0.14.6
Downloading gnome-desktop-1.0.0.0...
Configuring gnome-desktop-1.0.0.0...
Building gnome-desktop-1.0.0.0...
Failed to install gnome-desktop-1.0.0.0
Build log ( /home/builder/.cabal/logs/gnome-desktop-1.0.0.0.log ):
cabal: Entering directory '/tmp/cabal-tmp-7277/gnome-desktop-1.0.0.0'
Configuring gnome-desktop-1.0.0.0...
Building gnome-desktop-1.0.0.0...
Preprocessing executable 'gnome-desktop' for gnome-desktop-1.0.0.0...
[1 of 1] Compiling Main             ( Gnome_desktop.hs, dist/build/gnome-desktop/gnome-desktop-tmp/Main.o )

Gnome_desktop.hs:64:3: error:
    • No instance for (gconf-0.13.1.0:System.Gnome.GConf.GConfValue.GConfPrimitiveValueClass
                         Char)
        arising from a use of ‘gconfSet’
    • In a stmt of a 'do' block:
        gconfSet conf "/desktop/gnome/background/picture_filename" file
      In the expression:
        do { g <- readIORef random_generator_ior;
             let (n, g') = randomR ... g
                 file = head $ drop (n - 1) files;
             writeIORef random_generator_ior g';
             gconfSet conf "/desktop/gnome/background/picture_filename" file;
             .... }
      In an equation for ‘set_picture’:
          set_picture conf files len random_generator_ior
            = do { g <- readIORef random_generator_ior;
                   let (n, g') = ...
                       ....;
                   writeIORef random_generator_ior g';
                   .... }
cabal: Leaving directory '/tmp/cabal-tmp-7277/gnome-desktop-1.0.0.0'
cabal: Error: some packages failed to install:
gnome-desktop-1.0.0.0 failed during the building phase. The exception was:
ExitFailure 1