Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: gi-gtk (user goal)
rejecting: gi-gtk-3.0.6, gi-gtk-3.0.5, gi-gtk-3.0.4 (constraint from user
target requires ==3.0.3)
trying: gi-gtk-3.0.3
next goal: haskell-gi (dependency of gi-gtk-3.0.3)
rejecting: haskell-gi-0.18, haskell-gi-0.17.4 (conflict: requires pkg-config
package gobject-introspection-1.0>=1.32, not found in the pkg-config database)
rejecting: haskell-gi-0.17.3 (conflict: requires pkg-config package
gobject-introspection-1.0>=1.42, not found in the pkg-config database)
rejecting: haskell-gi-0.17.2, haskell-gi-0.17.1, haskell-gi-0.17,
haskell-gi-0.15, haskell-gi-0.14, haskell-gi-0.13, haskell-gi-0.12,
haskell-gi-0.11, haskell-gi-0.10.2, haskell-gi-0.10.1, haskell-gi-0.10,
haskell-gi-0.9, haskell-gi-0.8 (conflict: gi-gtk => haskell-gi>=0.17.3 && <1)
Dependency tree exhaustively searched.