Resolving dependencies...
Error: [Cabal-7138]
Could not resolve dependencies:
[__0] trying: jsaddle-hello-2.0.0.2 (user goal)
[__1] trying: jsaddle-webkit2gtk-0.9.9.3 (dependency of jsaddle-hello)
[__2] next goal: webkit2gtk3-javascriptcore (dependency of jsaddle-webkit2gtk)
[__2] rejecting: webkit2gtk3-javascriptcore; 0.14.4.6, 0.14.4.5, 0.14.4.4, 0.14.4.3, 0.14.4.2, 0.14.4.1, 0.14.4.0, 0.14.3.0, 0.14.2.1 (conflict: pkg-config package webkit2gtk-4.0>=1.1.15, not found in the pkg-config database)
[__2] 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-hello