Resolving dependencies...
Starting     flatparse-0.3.0.2
Building     flatparse-0.3.0.2
Failed to install flatparse-0.3.0.2
Build log ( /home/builder/.cabal/logs/ghc-8.10.2/flatparse-0.3.0.2-9WJustQ6K05CWv8jDv6WVG.log ):
cabal: Entering directory '/tmp/cabal-tmp-6793/flatparse-0.3.0.2'
Configuring flatparse-0.3.0.2...
Preprocessing library for flatparse-0.3.0.2..
Building library for flatparse-0.3.0.2..

<no location info>: error:
    Warning: Couldn't figure out LLVM version!
             Make sure you have installed LLVM 9

<no location info>: error:
    Warning: Couldn't figure out LLVM version!
             Make sure you have installed LLVM 9

<no location info>: error:
    Warning: Couldn't figure out LLVM version!
             Make sure you have installed LLVM 9

<no location info>: error:
    Warning: Couldn't figure out LLVM version!
             Make sure you have installed LLVM 9

<no location info>: error:
    Warning: Couldn't figure out LLVM version!
             Make sure you have installed LLVM 9

<no location info>: 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 )

<no location info>: error:
    Warning: Couldn't figure out LLVM version!
             Make sure you have installed LLVM 9
ghc: could not execute: opt
cabal: Leaving directory '/tmp/cabal-tmp-6793/flatparse-0.3.0.2'
cabal: Error: some packages failed to install:
flatparse-0.3.0.2-9WJustQ6K05CWv8jDv6WVG failed during the building phase. The
exception was:
ExitFailure 1