Hello, $ cabal install webkitgtk3 Resolving dependencies... [1 of 2] Compiling SetupWrapper ( /var/folders/27/1y1549hn7pqfvvd0zv7znvlm0000gn/T/webkitgtk3-0.12.6.1-5804/webkitgtk3-0.12.6.1/SetupWrapper.hs, /var/folders/27/1y1549hn7pqfvvd0zv7znvlm0000gn/T/webkitgtk3-0.12.6.1-5804/webkitgtk3-0.12.6.1/dist/setup/SetupWrapper.o ) [2 of 2] Compiling Main ( /var/folders/27/1y1549hn7pqfvvd0zv7znvlm0000gn/T/webkitgtk3-0.12.6.1-5804/webkitgtk3-0.12.6.1/Setup.hs, /var/folders/27/1y1549hn7pqfvvd0zv7znvlm0000gn/T/webkitgtk3-0.12.6.1-5804/webkitgtk3-0.12.6.1/dist/setup/Main.o ) Linking /var/folders/27/1y1549hn7pqfvvd0zv7znvlm0000gn/T/webkitgtk3-0.12.6.1-5804/webkitgtk3-0.12.6.1/dist/setup/setup ... [1 of 2] Compiling Gtk2HsSetup ( Gtk2HsSetup.hs, dist/setup-wrapper/Gtk2HsSetup.o ) [2 of 2] Compiling Main ( SetupMain.hs, dist/setup-wrapper/Main.o ) Linking dist/setup-wrapper/setup ... Configuring webkitgtk3-0.12.6.1... setup: The pkg-config package webkitgtk-3.0 version >=1.8 is required but it could not be found. Failed to install webkitgtk3-0.12.6.1 cabal: Error: some packages failed to install: webkitgtk3-0.12.6.1 failed during the configure step. The exception was: ExitFailure 1 What's going on there?