Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: cairo (user goal)
[__0] rejecting: cairo-0.13.8.1 (conflict: pkg-config package cairo==1.2.0 ||
>1.2.0, not found in the pkg-config database)
[__0] rejecting: cairo-0.13.8.0, cairo-0.13.6.1, cairo-0.13.6.0,
cairo-0.13.5.0, cairo-0.13.4.2, cairo-0.13.4.1, cairo-0.13.4.0,
cairo-0.13.3.1, cairo-0.13.3.0, cairo-0.13.2.0, cairo-0.13.1.1,
cairo-0.13.1.0, cairo-0.13.0.6, cairo-0.13.0.5, cairo-0.13.0.4,
cairo-0.13.0.3, cairo-0.13.0.2, cairo-0.13.0.1, cairo-0.13.0.0,
cairo-0.12.5.3, cairo-0.12.5.1, cairo-0.12.5.0, cairo-0.12.4, cairo-0.12.3.1,
cairo-0.12.3, cairo-0.12.2, cairo-0.12.1, cairo-0.12.0, cairo-0.11.1,
cairo-0.11.0 (constraint from user target requires ==0.13.8.1)
[__0] fail (backjumping, conflict set: cairo)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: cairo