Hi Graeme,

The DYLD_FALLBACK_LIBRARY_PATH is prepended because we want cctbx libraries to come before any other user defined libraries when running cctbx code. Otherwise, there is no way to guarantee that any libraries that the user overrides in their environment will actually work with cctbx code.  

Are you using conda? How did you construct your conda environment? You should be able to use "conda install napari" in your conda_base directory or some other conda environment that you use for building. Can you list your environment (i.e. conda list)? And the explicit one so that it can be reproduced (conda list -e --explicit --md5)? Also, steps to reproduce your build would be helpful in reproducing the error.

I tested "conda install -c conda-forge napari" in my Python 3.7 conda_base directory and the import works without any errors from cctbx.python.

--
Billy K. Poon
Research Scientist, Molecular Biophysics and Integrated Bioimaging
Lawrence Berkeley National Laboratory
1 Cyclotron Road, M/S 33R0345
Berkeley, CA 94720
Fax: (510) 486-5909


On Tue, Dec 14, 2021 at 9:30 AM Winter, Graeme (DLSLtd,RAL,LSCI) <Graeme.Winter@diamond.ac.uk> wrote:
Hi Folks,

By default cctbx dispatchers on macOS clobber DYLD_FALLBACK_LIBRARY_PATH with some stuff which means that

from napari import viewer

fails with a huge stack trace ending in

OSError: dlopen(libobjc.dylib, 6): image not found

If I comment out the clobbering in the dispatcher then everything works fine so I am fairly sure this is the problem

Some questions -

 - why do we do this?
 - is there a way I can make a dispatcher not to this? or maybe leave the system DYLD… as it was and _append_ to rather than prepend?

Seems like a thing I am surprised I have not broken a toe on before now

Thanks Graeme



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