Build wxPython on arm64 architecture

Hello,
currently we are trying to build the latest git sources on a arm64 device 
running 

Distributor ID: Ubuntu
Description:    Ubuntu 16.04.3 LTS
Release:        16.04
Codename:       xenial


All prerequisites, as mentioned on https://github.com/wxWidgets/Phoenix, 
have been installed.
First run of python build.py dox etg sip build failed

ERROR: Could not execute 
/mnt/usb_disc/repos/phoenix/bin/doxygen-1.8.8-linux, got "[Errno 8] Exec 
format error"
       Set DOXYGEN in the environment to use a local build of doxygen 
instead

So we installed doxgen via apt-get, this installed version 1.8.11.1, 
exported DOXYGEN variable and run again.

Now dox part finished without error but next step etg fails with

ERROR: Graphviz command `dot` cannot be run (needed for Graphviz output), 
check your ``PATH`` setting
Traceback (most recent call last):
  File "etg/_core.py", line 478, in <module>
    run()
  File "etg/_core.py", line 471, in run
    tools.runGenerators(module)
  File "/mnt/usb_disc/repos/phoenix/etgtools/tweaker_tools.py", line 617, 
in runGenerators
    g.generate(module)
  File "/mnt/usb_disc/repos/phoenix/etgtools/sphinx_generator.py", line 
2909, in generate
    self.generateModule(module)
  File "/mnt/usb_disc/repos/phoenix/etgtools/sphinx_generator.py", line 
2982, in generateModule
    function(item)
  File "/mnt/usb_disc/repos/phoenix/etgtools/sphinx_generator.py", line 
3094, in generatePyClass
    docstring.Dump()
  File "/mnt/usb_disc/repos/phoenix/etgtools/sphinx_generator.py", line 
2337, in Dump
    return function(write)
  File "/mnt/usb_disc/repos/phoenix/etgtools/sphinx_generator.py", line 
2368, in DumpClass
    png, map = inheritance_diagram.makeInheritanceDiagram()
  File "/mnt/usb_disc/repos/phoenix/sphinxtools/inheritance.py", line 279, 
in makeInheritanceDiagram
    stdout, stderr = p.communicate(code)
UnboundLocalError: local variable 'p' referenced before assignment
Command '"/usr/bin/python" etg/_core.py --sip' failed with exit code 1.

This is a little mystic for me, what does it mean? Searching the web didn't 
really reveal its secret

I remember one had already built on a RPi3, so it should be possible, in 
general, shouldn't it?

Thank you
Claudia


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