I’ll give it a go on Monday.

> On 5/08/2017, at 23:56, Frédéric Chapoton <fchapot...@gmail.com> wrote:
> 
> Indeed. I should probably use "make build" and try again, but this takes so 
> long. I have installed gdb and got a longer log.
> 
> I have met the issue that you report with Unknown. It needs to be fixed, for 
> sure.
> 
> Could you please try with the branch "public/python3-experiment-v0" that I 
> have just put in trac. This is a (very ugly) sequence of ad-hoc fix-up 
> commits, just to see up to where we can go.
> 
> Frederic
> 
> Le samedi 5 août 2017 13:38:31 UTC+2, François Bissey a écrit :
> 
> > On 5/08/2017, at 23:22, Frédéric Chapoton <fchap...@gmail.com> wrote: 
> > 
> > /home/chapoton/sage3/local/lib/libpython2.7.so.1.0(PyInt_FromLong+0x53)[0x7f950a139ef3]
> >  
> > /home/chapoton/sage3/local/lib/libpynac.so.13(+0x88196)[0x7f950a559196] 
> > 
> 
> Pynac still being built and link to python 2.7 may be your cause of trouble. 
> 
> In sage-on-gentoo I have managed to build everything python3.6 (including 
> pynac). 
> I also crash on startup but not with a segfault: 
> fbissey@moonloop ~ $ EPYTHON=python3.6 sage 
> ┌────────────────────────────────────────────────────────────────────┐ 
> │ SageMath version 8.1.beta0, Release Date: 2017-07-29               │ 
> │ Type "notebook()" for the browser-based notebook interface.        │ 
> │ Type "help()" for help.                                            │ 
> └────────────────────────────────────────────────────────────────────┘ 
> ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓ 
> ┃ Warning: this is a prerelease version, and it may be unstable.     ┃ 
> ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛ 
> 
> ********************************************************************** 
> 
> Oops, Sage crashed. We do our best to make it stable, but... 
> 
> A crash report was automatically generated with the following information: 
>   - A verbatim copy of the crash traceback. 
>   - A copy of your input history during this session. 
>   - Data on your current Sage configuration. 
> 
> It was left in the file named: 
>         '/home/fbissey/.ipython/Sage_crash_report.txt’ 
> 
> Crash log in attachment. 
> 
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