Resolving dependencies... Starting flatparse-0.3.0.0 Building flatparse-0.3.0.0 Failed to install flatparse-0.3.0.0 Build log ( /home/builder/.cabal/logs/ghc-8.10.2/flatparse-0.3.0.0-5vJ61xSD0Xu3vIe6ZhRsaL.log ): cabal: Entering directory '/tmp/cabal-tmp-10363/flatparse-0.3.0.0' Configuring flatparse-0.3.0.0... Preprocessing library for flatparse-0.3.0.0.. Building library for flatparse-0.3.0.0.. : error: Warning: Couldn't figure out LLVM version! Make sure you have installed LLVM 9 [1 of 6] Compiling FlatParse.Internal ( src/FlatParse/Internal.hs, dist/build/FlatParse/Internal.o, dist/build/FlatParse/Internal.dyn_o ) src/FlatParse/Internal.hs:12:1: error: Could not find module GHC.Num.Integer Perhaps you meant GHC.Integer (from integer-gmp-1.0.3.0) Use -v (or `:set -v` in ghci) to see a list of the files searched for. | 12 | import GHC.Num.Integer (Integer(..)) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cabal: Leaving directory '/tmp/cabal-tmp-10363/flatparse-0.3.0.0' cabal: Error: some packages failed to install: flatparse-0.3.0.0-5vJ61xSD0Xu3vIe6ZhRsaL failed during the building phase. The exception was: ExitFailure 1