Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: gi-webkit2 (user goal)
rejecting: gi-webkit2-4.0.6, gi-webkit2-4.0.5, gi-webkit2-4.0.4 (constraint
from user target requires ==4.0.3)
rejecting: gi-webkit2-4.0.3 (conflict: requires pkg-config package
webkit2gtk-4.0-any, not found in the pkg-config database)
rejecting: gi-webkit2-4.0.2, gi-webkit2-4.0.1, gi-webkit2-0.2.12.15,
gi-webkit2-0.2.12.14, gi-webkit2-0.2.10.13, gi-webkit2-0.2.10.12,
gi-webkit2-0.2.10.10, gi-webkit2-0.2.8.12, gi-webkit2-0.2.8.11 (constraint
from user target requires ==4.0.3)
Dependency tree exhaustively searched.