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Building optparse-simple-0.0.4...
Failed to install optparse-simple-0.0.4
Build log ( /home/builder/.cabal/logs/optparse-simple-0.0.4.log ):
cabal: Entering directory '/tmp/cabal-tmp-1828/optparse-simple-0.0.4'
Configuring optparse-simple-0.0.4...
Building optparse-simple-0.0.4...
Preprocessing library optparse-simple-0.0.4...
[1 of 1] Compiling Options.Applicative.Simple ( src/Options/Applicative/Simple.hs, dist/build/Options/Applicative/Simple.o )

src/Options/Applicative/Simple.hs:42:1: error:
    Failed to load interface for ‘Control.Monad.Trans.Either’
    Perhaps you meant
      Control.Monad.Trans.Iter (needs flag -package-key free-4.12.4)
      Control.Monad.Trans.Writer (from transformers-0.5.2.0)
      Control.Monad.Trans.Error (from transformers-0.5.2.0)
    Use -v to see a list of the files searched for.
cabal: Leaving directory '/tmp/cabal-tmp-1828/optparse-simple-0.0.4'
Configuring keys-3.11...
Building keys-3.11...
Configuring adjunctions-4.3...
Installed conduit-combinators-1.1.1
Building adjunctions-4.3...
Configuring x509-validation-1.6.9...
Installed keys-3.11
Building x509-validation-1.6.9...
Configuring x509-system-1.6.6...
Installed adjunctions-4.3
Installed x509-validation-1.6.9
Configuring tar-conduit-0.1.1...
Building x509-system-1.6.6...
Building tar-conduit-0.1.1...
Configuring kan-extensions-5.0.2...
Installed x509-system-1.6.6
Building kan-extensions-5.0.2...
Installed tar-conduit-0.1.1
Configuring tls-1.4.0...
Building tls-1.4.0...
Installed kan-extensions-5.0.2
Configuring pointed-5...
Building pointed-5...
Installed pointed-5
Configuring vector-instances-3.4...
Building vector-instances-3.4...
Installed vector-instances-3.4
Configuring mono-traversable-instances-0.1.0.0...
Building mono-traversable-instances-0.1.0.0...
Installed mono-traversable-instances-0.1.0.0
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Building classy-prelude-1.3.0...
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Building connection-0.2.8...
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Configuring classy-prelude-conduit-1.3.0...
Installed connection-0.2.8
Configuring http-client-tls-0.3.5.1...
Building classy-prelude-conduit-1.3.0...
Building http-client-tls-0.3.5.1...
Installed classy-prelude-conduit-1.3.0
Installed http-client-tls-0.3.5.1
Configuring http-conduit-2.2.3.2...
Building http-conduit-2.2.3.2...
Installed http-conduit-2.2.3.2
cabal: Error: some packages failed to install:
mega-sdist-0.3.0.4 depends on optparse-simple-0.0.4 which failed to install.
optparse-simple-0.0.4 failed during the building phase. The exception was:
ExitFailure 1