Resolving dependencies...
cabal: Could not resolve dependencies:
trying: jsaddle-webkit2gtk-0.9.0.0 (user goal)
next goal: webkit2gtk3-javascriptcore (dependency of
jsaddle-webkit2gtk-0.9.0.0)
rejecting: webkit2gtk3-javascriptcore-0.14.2.1 (conflict: requires pkg-config
package webkit2gtk-4.0>=1.1.15, not found in the pkg-config database)
Dependency tree exhaustively searched.