[Rivet] Eigen2

[Holger Schulz]

Frank Siegert wrote:
> With the recent addition of Eigen2, our pyext/ subdirectory wouldn't 
> compile anymore. This was easily fixable, but there is a more serious 
> problem:
>
> Since Eigen2 isn't being installed with Rivet any plugin analysis or 
> external interface using the Rivet library will break, because they 
> include Analysis.hh which includes Rivet.hh which [... Matrices.hh, 
> VectorN.hh ...] which includes Eigen/Core (which isn't being installed).
>
> Is there any plan to install Eigen2 or not include it in any headers?
>
> Frank
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>   
I just stumbled upon the same problem, adding a "-I/rivet/include/eigen2"
to the compiler solved the problem.

I found the Eigen include files in the Rivet source directory in 
include/eigen2,
so I think they are shipped with Rivet, right?

Holger