Hi Kai - As you found, when running GRC on Mac OS X from MacPorts, a bunch of 
import warnings are printed. They are harmless, though annoying.

Interestingly, those printed for my setup never reference Cheetah; not sure if 
this is a good or bad thing! Mine instead read the following, which is similar 
to a few of yours later on ... yet different too.
{{{
/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pkgutil.py:186:
 ImportWarning: Not importing directory 
'/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sphinxcontrib':
 missing __init__.py
  file, filename, etc = imp.find_module(subname, path)
}}}

I haven't looked very hard at trying to squelch them; maybe someone knows how 
... I'm not even sure where to start looking ... while the directories listed 
do indeed not contain __init__.py, they are not meant to ... Seems like a 
program mis-determining which directories to import from ... maybe.

Sorry I can't help more! - MLD

On Tue, Mar 6, 2018, at 4:50 PM, Kai Garrels wrote:
> since a few days, I get a lot of these messages when starting grc;
> gnuradio version v3.7-MacPorts-devel-git-47f86bce(20180302).
> 
> Flowgraphs seem to work though…this still sounds disturbing.
> 
> Any suggestions how to get rid of them?
> 
> Loading: "/Users/kai/gnuradio/gr-dab/examples/dab_receiver.grc"
> cheetah_DynamicallyCompiledCheetahTemplate_1520372416_78_91248.py:12: 
> ImportWarning: Not importing directory '/opt/local/Library/Frameworks/
> Python.framework/Versions/2.7/lib/python2.7/site-packages/builtins': 
> missing __init__.py

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