Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] next goal: fb-util (user goal)
[__0] rejecting: fb-util-0.2.0.0 (conflict: pkg-config package gflags-any, not
found in the pkg-config database)
[__0] rejecting: fb-util-0.1.0.1 (constraint from user target requires
==0.2.0.0)
[__0] fail (backjumping, conflict set: fb-util)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: fb-util