Resolving dependencies...
cabal: Could not resolve dependencies:
trying: tianbar-1.0.3.0 (user goal)
next goal: gi-webkit2 (dependency of tianbar-1.0.3.0)
rejecting: gi-webkit2-4.0.5, gi-webkit2-4.0.4, gi-webkit2-4.0.3,
gi-webkit2-4.0.2, gi-webkit2-4.0.1 (conflict: requires pkg-config package
webkit2gtk-4.0-any, not found in the pkg-config database)
rejecting: gi-webkit2-0.2.12.15, gi-webkit2-0.2.12.14 (conflict: requires
pkg-config package webkit2gtk-4.0>=2.12, not found in the pkg-config database)
rejecting: gi-webkit2-0.2.10.13, gi-webkit2-0.2.10.12, gi-webkit2-0.2.10.10
(conflict: requires pkg-config package webkit2gtk-4.0>=2.10, not found in the
pkg-config database)
rejecting: gi-webkit2-0.2.8.12, gi-webkit2-0.2.8.11 (conflict: requires
pkg-config package webkit2gtk-4.0>=2.8, not found in the pkg-config database)
Dependency tree exhaustively searched.