Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: gtk-sni-tray-0.1.0.0 (user goal)
[__1] trying: gi-gtk-3.0.22 (dependency of gtk-sni-tray)
[__2] next goal: haskell-gi (dependency of gi-gtk)
[__2] rejecting: haskell-gi-0.21.2, haskell-gi-0.21.1, haskell-gi-0.21.0
(conflict: pkg-config package gobject-introspection-1.0>=1.32, not found in
the pkg-config database)
[__2] rejecting: 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.*)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: gi-gtk, haskell-gi, gtk-sni-tray