Protoc 2.5.0 depedency is guaranteed to install by bigtop_toolchain.
You can see it under bigtop_toolchain/README.md

Cos

On Sat, Aug 02, 2014 at 01:23AM, Artem Ervits wrote:
Version: GnuPG v1.4.11 (GNU/Linux)

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=peDh
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