Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] next goal: hruby (user goal)
[__0] rejecting: hruby-0.5.1.0 (conflict: pkg-config package ruby-any, not
found in the pkg-config database)
[__0] rejecting: hruby-0.5.0.0, hruby-0.4.0.0, hruby-0.3.8.1, hruby-0.3.8,
hruby-0.3.7, hruby-0.3.6, hruby-0.3.5.4, hruby-0.3.5.3, hruby-0.3.5.1,
hruby-0.3.5, hruby-0.3.4.4, hruby-0.3.4.3, hruby-0.3.4.2, hruby-0.3.4.1,
hruby-0.3.4, hruby-0.3.3, hruby-0.3.2, hruby-0.3.1.6, hruby-0.3.1.5,
hruby-0.3.1.4, hruby-0.3.1.3, hruby-0.3.1.2, hruby-0.3.1.1, hruby-0.3.1,
hruby-0.3.0, hruby-0.2.9, hruby-0.2.8, hruby-0.2.7, hruby-0.2.6, hruby-0.2.5,
hruby-0.2.4, hruby-0.2.3, hruby-0.2.0, hruby-0.1.3, hruby-0.1.2, hruby-0.1.1,
hruby-0.1.0, hruby-0.0.3 (constraint from user target requires ==0.5.1.0)
[__0] fail (backjumping, conflict set: hruby)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: hruby