Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: haskell-gi (user goal)
rejecting: 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 (constraint from user
target requires ==0.9)
rejecting: haskell-gi-0.9 (conflict: requires pkg-config package
gobject-introspection-1.0>=1.42, not found in the pkg-config database)
rejecting: haskell-gi-0.8 (constraint from user target requires ==0.9)
Dependency tree exhaustively searched.