Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: gi-gtk-hs-0.3.6.3 (user goal)
[__1] trying: gi-gtk-3.0.25 (dependency of gi-gtk-hs)
[__2] next goal: haskell-gi (dependency of gi-gtk)
[__2] rejecting: haskell-gi-0.21.5, haskell-gi-0.21.4, haskell-gi-0.21.3,
haskell-gi-0.21.2, haskell-gi-0.21.1 (conflict: pkg-config package
gobject-introspection-1.0>=1.32, not found in the pkg-config database)
[__2] rejecting: haskell-gi-0.21.0, haskell-gi-0.20.3, haskell-gi-0.20.2,
haskell-gi-0.20.1, haskell-gi-0.20, haskell-gi-0.18, haskell-gi-0.17.4,
haskell-gi-0.17.3, 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>=0.21.1 &&
<0.22)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: gi-gtk, gi-gtk-hs, haskell-gi