Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: gi-gdk (user goal)
rejecting: gi-gdk-3.0.6, gi-gdk-3.0.5, gi-gdk-3.0.4, gi-gdk-3.0.3,
gi-gdk-3.0.2, gi-gdk-3.0.1, gi-gdk-0.3.18.15, gi-gdk-0.3.18.14,
gi-gdk-0.3.18.13, gi-gdk-0.3.18.12, gi-gdk-0.3.16.12 (constraint from user
target requires ==0.3.18.10)
rejecting: gi-gdk-0.3.18.10 (conflict: requires pkg-config package
gdk-3.0>=3.18, not found in the pkg-config database)
rejecting: gi-gdk-0.3.16.11, gi-gdk-0.3.16.10, gi-gdk-0.3.16.9,
gi-gdk-0.3.16.8 (constraint from user target requires ==0.3.18.10)
Dependency tree exhaustively searched.