Hi,

it seems that FreeCAD fails to compile because it can't find the mpi
library even though it's in the inputs. Same is true for
python-pyside-2, python-pyside-2-tools and python-shiboken-2.

--8<---------------cut here---------------start------------->8---
====================
shiboken2 not found.
====================

==================
PySide2 not found.
==================

=======================
PySide2Tools not found.
=======================
--8<---------------cut here---------------end--------------->8---

MPI just generates a warning

--8<---------------cut here---------------start------------->8---
-- Checking for one of the modules 'ompi-cxx'
CMake Warning at CMakeLists.txt:745 (message):
  mpi.h was not found.  Check for error above.
--8<---------------cut here---------------end--------------->8---

but the build fails with no direct error message (i didn't find one),
and tried to link against mpi (that's why i'm guessing it has something
to do with it).

Full build log is attached.