[CMake] FindProtobuf in specified dirs

[Homero Cardoso de Almeida]

Hello,

I'm working on enhancing the build process in my company by using CMake,
and I'm having trouble to have it find the Google Protocol Buffers binary
and libraries in a specific directory in my workspace.

Due to several reasons, we cannot install protobuffers directly in our
environment, so I have it download and unpack a zip file with the
protobuffer library and header files in a directory in my home folder.
However, when I use the find_package directive giving said folder as a hint
it complains that it could not find a protobuf-config.cmake file and fails.
I couldn't find any such file anywhere, the only thing coming close is a "
protobuf-config.cmake.in" in the protobuf source tree and I don't know if I
can use that.

Do I have to provide my own protobuf-config.cmake file, or I'm using it
completely wrong?

We are frozen in protocol buffers 2.4.1. I guess we can upgrade to 2.7.0,
but we can't use 3.0.x.

Thanks,
Homero.
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