please reject proj, the issue is that pcl needs an explicit dependency,
because vtk6 lost the direct one for the -dev package.

The really nice fix would have been to cherry-pick the vtk6 revert to
use the internal proj library, but this is unfeasible since it is an ABI
change. (see debian bug: #819741)

now, the smartest solution I could think is to add libproj-dev to pcl 
dependencies, even if this might result in an ABI break too.
https://launchpad.net/~costamagnagianfranco/+archive/ubuntu/locutusofborg-ppa/+packages
please test this package and specially pcl reverse-dependencies in xenial with 
this updated version

fixing vtk6 will require checks/rebuilds of ~10 reverse-dependencies (many of 
them might have been already built with the old vtk with embedded proj, so no 
change for them), while fixing pcl means only one reverse-dependency to 
check/fix
"ros-pcl-conversions"

so at the end, please test, and in case you agree with my analysis,
reject proj and accept pcl

** Changed in: pcl (Ubuntu Artful)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1704459

Title:
  rebuild needed because dependency changed location of exported
  libmpi.so library

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