Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] next goal: gi-gdk (user goal)
[__0] rejecting: gi-gdk-4.0.10, gi-gdk-4.0.9, gi-gdk-4.0.8, gi-gdk-4.0.7,
gi-gdk-4.0.5, gi-gdk-4.0.4, gi-gdk-4.0.3, gi-gdk-4.0.2, gi-gdk-4.0.1
(constraint from user target requires ==3.0.30)
[__0] trying: gi-gdk-3.0.30
[__1] next goal: gi-gdk3 (dependency of gi-gdk)
[__1] rejecting: gi-gdk3-3.0.30 (conflict: pkg-config package gdk-3.0-any, not
found in the pkg-config database)
[__1] fail (backjumping, conflict set: gi-gdk, gi-gdk3)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: gi-gdk, gi-gdk3