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Fixbug/eigen as dependency

Santiago Ospina De Los Ríos requested to merge sospinar-guest/dune-pdelab:fixbug/eigen-as-dependency into master

If libdune-pdelab-dev is installed without libeigne3-dev then dunecontrol will fail with any new dune-project depending on dune-pdelab.

To reproduce this error, you can use the debian:10 docker image.

# install dune-pdelab
apt-get update && apt-get install build-essential libdune-pdelab-dev

# create a new dune-project depending on dune-pdelab somewhere
cd /tmp
echo y | duneproject downstream-project dune-pdelab 2.6 email@example.com

# build the project
mkdir downstream-project/build
cd downstream-project/build
cmake ..

# faiulure because cmake was instructed to finde eigen include library...

Accordingly, this MR adds Eigen as a dependency.

Edited by Santiago Ospina De Los Ríos

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