retext in aur is broken?

[mudongliang <mudongliangabcd@xxxxxxxxxxx>]

I installed retext in the aur, but the retext seems broken.

$ retext
Traceback (most recent call last):
  File "/usr/bin/retext", line 22, in <module>
    from ReText import datadirs, globalSettings, app_version
  File "/usr/lib/python3.5/site-packages/ReText/__init__.py", line 17, 
in <module>
    import markups
ImportError: No module named 'markups'

But I found python-markups package installed in my system which provides 
this module.
What's wrong with it?
     - mudongliang