$ python3 Python 3.6.0 (default, Mar 21 2017, 17:30:34) [GCC 7.0.1 20170225 (Red Hat 7.0.1-0.10)] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import dlib Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib64/python3.6/site-packages/dlib/__init__.py", line 1, in <module> from .dlib import * ImportError: /usr/lib64/python3.6/site-packages/dlib/dlib.so: undefined symbol: _ZN5boost6python6detail11init_moduleER11PyModuleDefPFvvE >>>
I rebuilt the latest dlib package for F26 and I still get an error trying to import the package with python3: $ python3 Python 3.6.1 (default, Apr 19 2017, 11:56:23) [GCC 7.0.1 20170309 (Red Hat 7.0.1-0.12)] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import dlib Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib64/python3.6/site-packages/dlib/__init__.py", line 1, in <module> from .dlib import * ImportError: /usr/lib64/python3.6/site-packages/dlib/dlib.so: undefined symbol: _ZN5boost6python6detail11init_moduleER11PyModuleDefPFvvE >>>
Adding BuildRequires on boost-python-devel and boost-python3-devel fixes this problem. I think that without the BR of boost-python3-devel the build system links the Python 3 version of dlib with the Python 2 boost python library since that's the only one it can find.
dlib-18.18-7.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2017-f77e2a9205
dlib-18.18-7.fc26 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-f77e2a9205
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Fedora 26 changed to end-of-life (EOL) status on 2018-05-29. Fedora 26 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.