Bug#895419: Acknowledgement (python3-dolfin: JIT compilation fails as python3-instant tries to includes petsc4py from python2)

[Fabrice Silva]

Additional information from Johannes Ring (fenics dev) on 
https://groups.google.com/d/topic/fenics-support/mfJdWYwq0-w/discussion

   The problem is that the path to petsc4py is included in
   /usr/share/dolfin/cmake/DOLFINConfig.cmake and
   /usr/share/dolfin/cmake/DOLFINTargets.cmake, while it should only
   have been included in /usr/share/dolfin/cmake/DOLFINPython27.cmake
   and /usr/share/dolfin/cmake/DOLFINPython36.cmake.

   The quick fix would be to either install python-petsc4py (the
   petsc4py include files are the same for python2 and python3) or to
   remove the path to petsc4py from DOLFINConfig.cmake and
   DOLFINTargets.cmake.

These recommendations solve the trouble (even if other errors are still
raised in the overly-simplified script).

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