[Rprotobuf-yada] do we need to require protoc ?

[Romain Francois]

Hi,

It's been a while, but I'd like to be back on this track.

We absolutely need libproto, but I was wondering if we could not have to 
require protoc and basically compile with files with protoc at build 
time, as part of the vignette trick.

This would also reduce the complexity of the Makevars (e.g. we would not 
need an all target, etc ...)

Romain

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Romain Francois
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