$ wget https://github.com/protocolbuffers/protobuf/releases/download/v2.5.0/protobuf-2.5.0.tar.gz
  $ tar zxvf protobuf-2.5.0.tar.gz
  $ cd protobuf-2.5.0
  $ ./configure
  $ make
  $ make check
  $ make install
  $ protoc --version
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