waf 19.0.6 not compatible with python >= 3.7

[urp]

I get an error when running waf configure

python waf configure 
Traceback (most recent call last):
  File "/home/urp/Documents/Sandbox/pd-aubio/.waf3-1.9.6-1e8548ddb990ceb895e5c7946e836f9f/waflib/Node.py", line 297, in ant_iter
    raise StopIteration
StopIteration

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

Traceback (most recent call last):
  File "/home/urp/Documents/Sandbox/pd-aubio/.waf3-1.9.6-1e8548ddb990ceb895e5c7946e836f9f/waflib/Scripting.py", line 120, in waf_entry_point
    run_commands()
  File "/home/urp/Documents/Sandbox/pd-aubio/.waf3-1.9.6-1e8548ddb990ceb895e5c7946e836f9f/waflib/Scripting.py", line 177, in run_commands
    parse_options()
  File "/home/urp/Documents/Sandbox/pd-aubio/.waf3-1.9.6-1e8548ddb990ceb895e5c7946e836f9f/waflib/Scripting.py", line 150, in parse_options
    Context.create_context('options').execute()
  File "/home/urp/Documents/Sandbox/pd-aubio/.waf3-1.9.6-1e8548ddb990ceb895e5c7946e836f9f/waflib/Options.py", line 145, in execute
    super(OptionsContext,self).execute()
  File "/home/urp/Documents/Sandbox/pd-aubio/.waf3-1.9.6-1e8548ddb990ceb895e5c7946e836f9f/waflib/Context.py", line 88, in execute
    self.recurse([os.path.dirname(g_module.root_path)])
  File "/home/urp/Documents/Sandbox/pd-aubio/.waf3-1.9.6-1e8548ddb990ceb895e5c7946e836f9f/waflib/Context.py", line 129, in recurse
    user_function(self)
  File "/home/urp/Documents/Sandbox/pd-aubio/wscript", line 17, in options
    ctx.load('compiler_c')
  File "/home/urp/Documents/Sandbox/pd-aubio/.waf3-1.9.6-1e8548ddb990ceb895e5c7946e836f9f/waflib/Context.py", line 85, in load
    fun(self)
  File "/home/urp/Documents/Sandbox/pd-aubio/.waf3-1.9.6-1e8548ddb990ceb895e5c7946e836f9f/waflib/Tools/compiler_c.py", line 40, in options
    opt.load_special_tools('c_*.py',ban=['c_dumbpreproc.py'])
  File "/home/urp/Documents/Sandbox/pd-aubio/.waf3-1.9.6-1e8548ddb990ceb895e5c7946e836f9f/waflib/Context.py", line 319, in load_special_tools
    lst=self.root.find_node(waf_dir).find_node('waflib/extras').ant_glob(var)
  File "/home/urp/Documents/Sandbox/pd-aubio/.waf3-1.9.6-1e8548ddb990ceb895e5c7946e836f9f/waflib/Node.py", line 346, 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/urp/Documents/Sandbox/pd-aubio/.waf3-1.9.6-1e8548ddb990ceb895e5c7946e836f9f/waflib/Node.py", line 346, 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
make: *** [Makefile:33: configure] Error 2

See upstream waf pull request.
Updating waf version in scripts/get_waf.sh to latest (2.0.20) works for me.