package derive-2.3.0.2-ad85bd58710fede3f840a467e84c403e is unusable due to missing or recursive dependencies: haskell-src-exts-1.9.4-e0f8c55bea9fc97376aa3598dfdca6d6 package derive-2.4.1-415d44d2f93198aab5dff67866c17b64 is unusable due to missing or recursive dependencies: haskell-src-exts-1.9.4-e0f8c55bea9fc97376aa3598dfdca6d6 what does that mean? i reinstalled haskell-src-exts and derive, doesn't seem to make any difference Linking dist/build/derive/derive ... Installing library in /home/anatolyy/.cabal/lib/derive-2.4.1/ghc-6.12.3 Installing executable(s) in /home/anatolyy/.cabal/bin Registering derive-2.4.1... /home/anatolyy/.cabal/lib/haskell-src-exts-1.9.4/ghc-6.12.3 Registering haskell-src-exts-1.9.4... so i cant import Data.DeriveTH