According to what I see the the setup.py, it seems this package misses dependencies.

In D3274#52443, @Devil505 wrote:

added missing build & runtime depends

The builddeps are requires only for the unit tests I guess since it builds fine without them ?

python-txaio is needed to build. Could you try ?

It builds without any build dependency.

In D3274#52447, @kyrios123 wrote:

It builds without any build dependency.

Unhandled Error
Traceback (most recent call last):
  File "setup.py", line 302, in <module>
    list(getPlugins(IPlugin))
  File "/usr/lib/python3.6/site-packages/twisted/plugin.py", line 213, in getPlugins
    allDropins = getCache(package)
--- <exception caught here> ---
  File "/usr/lib/python3.6/site-packages/twisted/plugin.py", line 171, in getCache
    provider = pluginModule.load()
  File "/usr/lib/python3.6/site-packages/twisted/python/modules.py", line 392, in load
    return self.pathEntry.pythonPath.moduleLoader(self.name)
  File "/usr/lib/python3.6/site-packages/twisted/python/reflect.py", line 308, in namedAny
    topLevelPackage = _importAndCheckStack(trialname)
  File "/usr/lib/python3.6/site-packages/twisted/python/reflect.py", line 255, in _importAndCheckStack
    reraise(excValue, excTraceback)
  File "/usr/lib/python3.6/site-packages/twisted/python/compat.py", line 463, in reraise
    raise exception.with_traceback(traceback)
  File "/home/build/YPKG/root/python-autobahn/build/py3build/twisted/plugins/autobahn_endpoints.py", line 46, in <module>
    from autobahn.twisted.websocket import WrappingWebSocketServerFactory, \
  File "/home/build/YPKG/root/python-autobahn/build/py3build/autobahn/twisted/__init__.py", line 41, in <module>
    from autobahn.twisted.choosereactor import install_reactor
  File "/home/build/YPKG/root/python-autobahn/build/py3build/autobahn/twisted/choosereactor.py", line 32, in <module>
    import txaio
builtins.ModuleNotFoundError: No module named 'txaio'

In D3274#52449, @Devil505 wrote:

In D3274#52447, @kyrios123 wrote:

It builds without any build dependency.

Unhandled Error
Traceback (most recent call last):
  File "setup.py", line 302, in <module>
    list(getPlugins(IPlugin))
  File "/usr/lib/python3.6/site-packages/twisted/plugin.py", line 213, in getPlugins
    allDropins = getCache(package)
--- <exception caught here> ---
  File "/usr/lib/python3.6/site-packages/twisted/plugin.py", line 171, in getCache
    provider = pluginModule.load()
  File "/usr/lib/python3.6/site-packages/twisted/python/modules.py", line 392, in load
    return self.pathEntry.pythonPath.moduleLoader(self.name)
  File "/usr/lib/python3.6/site-packages/twisted/python/reflect.py", line 308, in namedAny
    topLevelPackage = _importAndCheckStack(trialname)
  File "/usr/lib/python3.6/site-packages/twisted/python/reflect.py", line 255, in _importAndCheckStack
    reraise(excValue, excTraceback)
  File "/usr/lib/python3.6/site-packages/twisted/python/compat.py", line 463, in reraise
    raise exception.with_traceback(traceback)
  File "/home/build/YPKG/root/python-autobahn/build/py3build/twisted/plugins/autobahn_endpoints.py", line 46, in <module>
    from autobahn.twisted.websocket import WrappingWebSocketServerFactory, \
  File "/home/build/YPKG/root/python-autobahn/build/py3build/autobahn/twisted/__init__.py", line 41, in <module>
    from autobahn.twisted.choosereactor import install_reactor
  File "/home/build/YPKG/root/python-autobahn/build/py3build/autobahn/twisted/choosereactor.py", line 32, in <module>
    import txaio
builtins.ModuleNotFoundError: No module named 'txaio'

This is because you are now building the package on top of twisted while in the original diff you submitted you built it on top of asyncio . Different frameworks -> different per-requisites. (installation manual)