Hi Jonathan,

I would like to report a problem when building ntk on arch linux.
It seems python 3.7 is breaking the waf build. I think it might be related to this PEP:

https://www.python.org/dev/peps/pep-0479/

This will probably break the non packages in the arch repository as well,
when they need to be rebuild.

Greetings,

lieven


P.S. The error happens already happens when doing ./waf configure


==> Starting build()...
Traceback (most recent call last):
  File "/home/lievenmoors/code/aur/ntk-git/src/fltk/.waf3-1.8.0-f4f5e7c10cf1681215dc56fc3b992944/waflib/Node.py", line 281, in ant_iter
    raise StopIteration
StopIteration

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/lievenmoors/code/aur/ntk-git/src/fltk/.waf3-1.8.0-f4f5e7c10cf1681215dc56fc3b992944/waflib/Scripting.py", line 98, in waf_entry_point
    run_commands()
  File "/home/lievenmoors/code/aur/ntk-git/src/fltk/.waf3-1.8.0-f4f5e7c10cf1681215dc56fc3b992944/waflib/Scripting.py", line 155, in run_commands
    parse_options()
  File "/home/lievenmoors/code/aur/ntk-git/src/fltk/.waf3-1.8.0-f4f5e7c10cf1681215dc56fc3b992944/waflib/Scripting.py", line 128, in parse_options
    Context.create_context('options').execute()
  File "/home/lievenmoors/code/aur/ntk-git/src/fltk/.waf3-1.8.0-f4f5e7c10cf1681215dc56fc3b992944/waflib/Options.py", line 136, in execute
    super(OptionsContext,self).execute()
  File "/home/lievenmoors/code/aur/ntk-git/src/fltk/.waf3-1.8.0-f4f5e7c10cf1681215dc56fc3b992944/waflib/Context.py", line 92, in execute
    self.recurse([os.path.dirname(g_module.root_path)])
  File "/home/lievenmoors/code/aur/ntk-git/src/fltk/.waf3-1.8.0-f4f5e7c10cf1681215dc56fc3b992944/waflib/Context.py", line 133, in recurse
    user_function(self)
  File "/home/lievenmoors/code/aur/ntk-git/src/fltk/wscript", line 64, in options
    opt.load('compiler_c')
  File "/home/lievenmoors/code/aur/ntk-git/src/fltk/.waf3-1.8.0-f4f5e7c10cf1681215dc56fc3b992944/waflib/Context.py", line 89, in load
    fun(self)
  File "/home/lievenmoors/code/aur/ntk-git/src/fltk/.waf3-1.8.0-f4f5e7c10cf1681215dc56fc3b992944/waflib/Tools/compiler_c.py", line 36, in options
    opt.load_special_tools('c_*.py',ban=['c_dumbpreproc.py'])
  File "/home/lievenmoors/code/aur/ntk-git/src/fltk/.waf3-1.8.0-f4f5e7c10cf1681215dc56fc3b992944/waflib/Context.py", line 289, in load_special_tools
lst=self.root.find_node(waf_dir).find_node('waflib/extras').ant_glob(var)
  File "/home/lievenmoors/code/aur/ntk-git/src/fltk/.waf3-1.8.0-f4f5e7c10cf1681215dc56fc3b992944/waflib/Node.py", line 330, in ant_glob     ret=[x for x in self.ant_iter(accept=accept,pats=[to_pat(incl),to_pat(excl)],maxdepth=kw.get('maxdepth',25),dir=dir,src=src,remove=kw.get('remove',True))]   File "/home/lievenmoors/code/aur/ntk-git/src/fltk/.waf3-1.8.0-f4f5e7c10cf1681215dc56fc3b992944/waflib/Node.py", line 330, in <listcomp>     ret=[x for x in self.ant_iter(accept=accept,pats=[to_pat(incl),to_pat(excl)],maxdepth=kw.get('maxdepth',25),dir=dir,src=src,remove=kw.get('remove',True))]
RuntimeError: generator raised StopIteration
==> ERROR: A failure occurred in build().
    Aborting...



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