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I've found an answer, although I dont know the source of the problem yet.

I was building all of ros under a python virtualenv pointing to homebrew python3.6. I deactivated the virtualenv and rebuilt - seems to work now. Whats really strange though is python inside and outside the virtualenv are linked to the same python:

Python 3.6.4 (default, Jan 6 2018, 11:51:15) [GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.39.2)] on darwin

For now I'll manage ROS outside virtualenvs. Although they are a nice way to isolate all the python packages ROS needs.

I've found an answer, although I dont know the source of the problem yet.

I was building all of ros under a python virtualenv pointing to homebrew python3.6. I deactivated the virtualenv and rebuilt - seems to work now. Whats really strange though is python inside and outside the virtualenv are linked to the same python:python3.6 from HomeBrew:

Python 3.6.4 (default, Jan 6 2018, 11:51:15) [GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.39.2)] on darwin

For now I'll manage ROS outside virtualenvs. Although they are a nice way to isolate all the python packages ROS needs.