Resolving dependencies...
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Starting     chronos-1.1.1
Building     chronos-1.1.1
Building     proto-lens-protobuf-types-0.6.0.0
Failed to install proto-lens-protobuf-types-0.6.0.0
Build log ( /home/builder/.cabal/logs/ghc-8.6.3/proto-lens-protobuf-types-0.6.0.0-GxqJSQcP9n74onLGSKPZlM.log ):
cabal: Entering directory '/tmp/cabal-tmp-27689/proto-lens-protobuf-types-0.6.0.0'
[1 of 1] Compiling Main             ( /tmp/cabal-tmp-27689/proto-lens-protobuf-types-0.6.0.0/dist/setup/setup.hs, /tmp/cabal-tmp-27689/proto-lens-protobuf-types-0.6.0.0/dist/setup/Main.o )
Linking /tmp/cabal-tmp-27689/proto-lens-protobuf-types-0.6.0.0/dist/setup/setup ...
Configuring proto-lens-protobuf-types-0.6.0.0...
==========
Error: couldn't find the executable "protoc" in your $PATH.
    Follow the installation instructions at https://google.github.io/proto-lens/installing-protoc.html .
==========
Missing executable "protoc"
CallStack (from HasCallStack):
  error, called at src/Data/ProtoLens/Setup.hs:371:13 in proto-lens-setup-0.4.0.4-1hKrYGa3dOLBmQvxn41R3W:Data.ProtoLens.Setup
cabal: Leaving directory '/tmp/cabal-tmp-27689/proto-lens-protobuf-types-0.6.0.0'
Completed    chronos-1.1.1
Completed    tls-1.5.4
Completed    lens-4.19.2
cabal: Error: some packages failed to install:
lightstep-haskell-0.10.3-HpBwqfTENq0GXJgBKS3Ymf depends on
lightstep-haskell-0.10.3 which failed to install.
proto-lens-protobuf-types-0.6.0.0-GxqJSQcP9n74onLGSKPZlM failed during the
building phase. The exception was:
ExitFailure 1