$ ghc-pkg field base depends use 'ghc-pkg recache' to fix. depends: ghc-prim-0.2.0.0-2feb0cb38f65a4827135ada88c34f3ef integer-gmp-0.2.0.1-72436e28c79d056c87cc0d2d2f9f3773 builtin_rts depends: base-4.2.0.2-0d1804f62045e52b2e806996d84f5318 syb-0.1.0.2-0917873f366b0be90a48082271223b4e