Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: jsaddle-webkit2gtk-0.9.8.4 (user goal)
[__1] next goal: webkit2gtk3-javascriptcore (dependency of jsaddle-webkit2gtk)
[__1] rejecting: 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)
[__1] 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