Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: ghcjs-dom-hello-6.0.0.1 (user goal)
[__1] trying: ghcjs-dom-hello:+webkit2gtk
[__2] trying: jsaddle-webkit2gtk-0.9.9.3 (dependency of ghcjs-dom-hello
+webkit2gtk)
[__3] next goal: webkit2gtk3-javascriptcore (dependency of jsaddle-webkit2gtk)
[__3] rejecting: webkit2gtk3-javascriptcore-0.14.4.6,
webkit2gtk3-javascriptcore-0.14.4.5, webkit2gtk3-javascriptcore-0.14.4.4,
webkit2gtk3-javascriptcore-0.14.4.3, webkit2gtk3-javascriptcore-0.14.4.2,
webkit2gtk3-javascriptcore-0.14.4.1, webkit2gtk3-javascriptcore-0.14.4.0,
webkit2gtk3-javascriptcore-0.14.3.0, webkit2gtk3-javascriptcore-0.14.2.1
(conflict: pkg-config package webkit2gtk-4.0>=1.1.15, not found in the
pkg-config database)
[__3] fail (backjumping, conflict set: jsaddle-webkit2gtk,
webkit2gtk3-javascriptcore)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: webkit2gtk3-javascriptcore,
jsaddle-webkit2gtk, jsaddle-webkitgtk, ghcjs-dom-hello,
ghcjs-dom-hello:webkit2gtk, webkitgtk3-javascriptcore
Try running with --minimize-conflict-set to improve the error message.