Resolving dependencies... Configuring mtl-2.2.1... Configuring text-1.2.2.1... Building mtl-2.2.1... Building text-1.2.2.1... Installed mtl-2.2.1 Installed text-1.2.2.1 Configuring parsec-3.1.11... Building parsec-3.1.11... Installed parsec-3.1.11 Configuring baskell-0.1... Building baskell-0.1... Failed to install baskell-0.1 Build log ( /home/builder/.cabal/logs/baskell-0.1.log ): cabal: Entering directory '/tmp/cabal-tmp-25065/baskell-0.1' Configuring baskell-0.1... Warning: 'ghc-options: -prof' is not necessary and will lead to problems when used on a library. Use the configure flag --enable-library-profiling and/or --enable-profiling. Building baskell-0.1... Preprocessing executable 'baskell' for baskell-0.1... [ 1 of 13] Compiling Pretty ( src/Pretty.hs, dist/build/baskell/baskell-tmp/Pretty.o ) src/Pretty.hs:47:11: warning: [-Wunused-matches] Defined but not used: ‘x’ [ 2 of 13] Compiling Type ( src/Type.hs, dist/build/baskell/baskell-tmp/Type.o ) src/Type.hs:52:1: error: Failed to load interface for ‘Utils’ Perhaps you meant Util (needs flag -package-key ghc-8.0.1.20161018) Use -v to see a list of the files searched for. cabal: Leaving directory '/tmp/cabal-tmp-25065/baskell-0.1' cabal: Error: some packages failed to install: baskell-0.1 failed during the building phase. The exception was: ExitFailure 1