Resolving dependencies... Configuring primes-0.2.1.0... Building primes-0.2.1.0... Installed primes-0.2.1.0 Configuring primes-type-0.2.0.2... Building primes-type-0.2.0.2... Failed to install primes-type-0.2.0.2 Build log ( /home/builder/.cabal/logs/primes-type-0.2.0.2.log ): cabal: Entering directory '/tmp/cabal-tmp-7965/primes-type-0.2.0.2' Configuring primes-type-0.2.0.2... Building primes-type-0.2.0.2... Preprocessing library primes-type-0.2.0.2... [1 of 2] Compiling Paths_primes_type ( dist/build/autogen/Paths_primes_type.hs, dist/build/Paths_primes_type.o ) [2 of 2] Compiling Data.Numbers.Primes.Type ( src/Data/Numbers/Primes/Type.hs, dist/build/Data/Numbers/Primes/Type.o ) src/Data/Numbers/Primes/Type.hs:51:10: error: Not in scope: type constructor or class ‘NFData1’ Perhaps you meant ‘NFData’ (imported from Control.DeepSeq) cabal: Leaving directory '/tmp/cabal-tmp-7965/primes-type-0.2.0.2' cabal: Error: some packages failed to install: primes-type-0.2.0.2 failed during the building phase. The exception was: ExitFailure 1