Resolving dependencies... Configuring cereal-0.5.4.0... Configuring entropy-0.3.7... Building cereal-0.5.4.0... Building entropy-0.3.7... Installed entropy-0.3.7 Configuring primitive-0.6.1.0... Configuring transformers-compat-0.5.1.4... Installed cereal-0.5.4.0 Building primitive-0.6.1.0... Building transformers-compat-0.5.1.4... Installed transformers-compat-0.5.1.4 Configuring tagged-0.8.5... Building tagged-0.8.5... Installed primitive-0.6.1.0 Configuring vector-0.11.0.0... Building vector-0.11.0.0... Installed tagged-0.8.5 Configuring crypto-api-0.13.2... Building crypto-api-0.13.2... Installed crypto-api-0.13.2 Installed vector-0.11.0.0 Configuring hF2-0.2... Building hF2-0.2... Failed to install hF2-0.2 Build log ( /home/builder/.cabal/logs/hF2-0.2.log ): cabal: Entering directory '/tmp/cabal-tmp-15837/hF2-0.2' Configuring hF2-0.2... Building hF2-0.2... Preprocessing library hF2-0.2... [1 of 1] Compiling Data.F2 ( src/Data/F2.hs, dist/build/Data/F2.o ) src/Data/F2.hs:33:1: warning: [-Wunused-imports] The qualified import of ‘P.div, P.even, P.mod, P.odd’ from module ‘Prelude’ is redundant src/Data/F2.hs:46:14: warning: [-Wdeprecations] In the use of ‘bitSize’ (imported from Data.Bits): Deprecated: "Use 'bitSizeMaybe' or 'finiteBitSize' instead" src/Data/F2.hs:83:10: warning: [-Wmissing-methods] • No explicit implementation for either ‘negate’ or ‘-’ • In the instance declaration for ‘Num F2’ src/Data/F2.hs:112:10: warning: [-Wmissing-methods] • No explicit implementation for ‘Data.Bits.bitSizeMaybe’ • In the instance declaration for ‘B.Bits F2’ You are using an unsupported version of LLVM! Currently only 3.7 is supported. We will try though... opt: /tmp/ghc17363_0/ghc_2.ll:7:6: error: expected type !0 = !{!"top", null} ^ `opt' failed in phase `LLVM Optimiser'. (Exit code: 1) cabal: Leaving directory '/tmp/cabal-tmp-15837/hF2-0.2' cabal: Error: some packages failed to install: hF2-0.2 failed during the building phase. The exception was: ExitFailure 1 hecc-0.4 depends on hF2-0.2 which failed to install.