Warning: The install command is a part of the legacy v1 style of cabal usage.

Please switch to using either the new project style and the new-install
command or the legacy v1-install alias as new-style projects will become the
default in the next version of cabal-install. Please file a bug if you cannot
replicate a working v1- use case with the new-style commands.

For more information, see: https://wiki.haskell.org/Cabal/NewBuild

Resolving dependencies...
Starting     StateVar-1.1.1.1
Starting     base-orphans-0.8
Starting     cabal-doctest-1.0.6
Starting     data-default-class-0.1.2.0
Building     data-default-class-0.1.2.0
Building     StateVar-1.1.1.1
Building     cabal-doctest-1.0.6
Building     base-orphans-0.8
Completed    base-orphans-0.8
Starting     hashable-1.2.7.0
Completed    data-default-class-0.1.2.0
Completed    StateVar-1.1.1.1
Starting     integer-logarithms-1.0.2.2
Starting     haskell-src-exts-1.20.3
Building     hashable-1.2.7.0
Building     integer-logarithms-1.0.2.2
Building     haskell-src-exts-1.20.3
Completed    cabal-doctest-1.0.6
Starting     lens-family-core-1.2.3
Building     lens-family-core-1.2.3
Completed    integer-logarithms-1.0.2.2
Starting     primitive-0.6.4.0
Building     primitive-0.6.4.0
Completed    hashable-1.2.7.0
Starting     random-1.1
Building     random-1.1
Completed    lens-family-core-1.2.3
Starting     semigroups-0.18.5
Building     semigroups-0.18.5
Completed    semigroups-0.18.5
Starting     tagged-0.8.6
Building     tagged-0.8.6
Completed    random-1.1
Starting     th-abstraction-0.2.11.0
Building     th-abstraction-0.2.11.0
Completed    tagged-0.8.6
Starting     transformers-compat-0.6.2
Building     transformers-compat-0.6.2
Completed    th-abstraction-0.2.11.0
Starting     void-0.7.2
Building     void-0.7.2
Completed    void-0.7.2
Starting     contravariant-1.5
Completed    transformers-compat-0.6.2
Starting     lens-family-1.2.3
Building     contravariant-1.5
Building     lens-family-1.2.3
Completed    primitive-0.6.4.0
Starting     distributive-0.6
Completed    contravariant-1.5
Starting     exceptions-0.10.0
Completed    lens-family-1.2.3
Starting     scientific-0.3.6.2
Building     exceptions-0.10.0
Building     distributive-0.6
Building     scientific-0.3.6.2
Completed    distributive-0.6
Starting     comonad-5.0.4
Completed    exceptions-0.10.0
Starting     temporary-1.3
Completed    scientific-0.3.6.2
Starting     attoparsec-0.13.2.2
Building     temporary-1.3
Building     attoparsec-0.13.2.2
Building     comonad-5.0.4
Completed    temporary-1.3
Completed    comonad-5.0.4
Starting     bifunctors-5.5.3
Building     bifunctors-5.5.3
Completed    attoparsec-0.13.2.2
Completed    bifunctors-5.5.3
Starting     profunctors-5.3
Building     profunctors-5.3
Completed    profunctors-5.3
Starting     lens-labels-0.2.0.3
Building     lens-labels-0.2.0.3
Completed    lens-labels-0.2.0.3
Starting     proto-lens-0.3.1.3
Building     proto-lens-0.3.1.3
Completed    proto-lens-0.3.1.3
Completed    haskell-src-exts-1.20.3
Starting     proto-lens-protoc-0.3.1.3
Building     proto-lens-protoc-0.3.1.3
Completed    proto-lens-protoc-0.3.1.3
Starting     proto-lens-protobuf-types-0.3.0.3
Building     proto-lens-protobuf-types-0.3.0.3
Failed to install proto-lens-protobuf-types-0.3.0.3
Build log ( /home/builder/.cabal/logs/ghc-8.6.3/proto-lens-protobuf-types-0.3.0.3-7ISQuqy0iju2uJnlLttygu.log ):
cabal: Entering directory '/tmp/cabal-tmp-13831/proto-lens-protobuf-types-0.3.0.3'
[1 of 1] Compiling Main             ( /tmp/cabal-tmp-13831/proto-lens-protobuf-types-0.3.0.3/dist/setup/setup.hs, /tmp/cabal-tmp-13831/proto-lens-protobuf-types-0.3.0.3/dist/setup/Main.o )
Linking /tmp/cabal-tmp-13831/proto-lens-protobuf-types-0.3.0.3/dist/setup/setup ...
Configuring proto-lens-protobuf-types-0.3.0.3...
==========
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:416:13 in proto-lens-protoc-0.3.1.3-4uHnsdF61MJFZowAcC3xDq:Data.ProtoLens.Setup
cabal: Leaving directory '/tmp/cabal-tmp-13831/proto-lens-protobuf-types-0.3.0.3'
cabal: Error: some packages failed to install:
proto-lens-protobuf-types-0.3.0.3-7ISQuqy0iju2uJnlLttygu failed during the
building phase. The exception was:
ExitFailure 1