Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: gi-webkit2webextension (user goal)
rejecting: gi-webkit2webextension-4.0.12 (conflict: requires pkg-config
package webkit2gtk-web-extension-4.0-any, not found in the pkg-config
database)
rejecting: gi-webkit2webextension-4.0.11, gi-webkit2webextension-4.0.10,
gi-webkit2webextension-4.0.9, gi-webkit2webextension-4.0.8,
gi-webkit2webextension-4.0.7, gi-webkit2webextension-4.0.6,
gi-webkit2webextension-4.0.5, gi-webkit2webextension-4.0.4,
gi-webkit2webextension-4.0.3, gi-webkit2webextension-4.0.2,
gi-webkit2webextension-4.0.1, gi-webkit2webextension-0.2.12.15,
gi-webkit2webextension-0.2.12.14, gi-webkit2webextension-0.2.10.13,
gi-webkit2webextension-0.2.10.12, gi-webkit2webextension-0.2.8.12 (constraint
from user target requires ==4.0.12)
Dependency tree exhaustively searched.