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Installing protoc

In order to build Haskell packages with proto-lens, the Google protobuf compiler (which is a standalone binary named protoc) needs to be installed somewhere on your $PATH. You can get it by downloading the corresponding file for your system from https://github.com/google/protobuf/releases. (The corresponding file will be named something like protoc-*-.zip.)

Here are some OS-specific options for installing the binary. These instructions also install basic .proto files like wrappers.proto, any.proto and descriptor.proto. (Those files aren't needed by proto-lens itself, but they may be useful for other language bindings/plugins.)

Mac OS X

  • If you have Homebrew (which you can get from https://brew.sh), just run:

    brew install protobuf

    If you see any error messages, run brew doctor, follow any recommended fixes, and try again. If it still fails, try instead:

    brew upgrade protobuf

  • Alternately, run the following commands:

    PROTOC_ZIP=protoc-3.14.0-osx-x86_64.zip
curl -OL https://github.com/protocolbuffers/protobuf/releases/download/v3.14.0/$PROTOC_ZIP
sudo unzip -o $PROTOC_ZIP -d /usr/local bin/protoc
sudo unzip -o $PROTOC_ZIP -d /usr/local 'include/*'
rm -f $PROTOC_ZIP

Linux

  • Run the following commands:

    PROTOC_ZIP=protoc-3.14.0-linux-x86_64.zip
curl -OL https://github.com/protocolbuffers/protobuf/releases/download/v3.14.0/$PROTOC_ZIP
sudo unzip -o $PROTOC_ZIP -d /usr/local bin/protoc
sudo unzip -o $PROTOC_ZIP -d /usr/local 'include/*'
rm -f $PROTOC_ZIP

  • Alternately, manually download and install protoc from here.