Considering I routinely build pynac with python2.7, 3.4 and 3.6 
in gentoo that’s quite odd. Could you please post pynac’s config.log

> On 6/08/2017, at 19:00, Frédéric Chapoton <fchapot...@gmail.com> wrote:
> 
> I tried "PYTHON=python3 ./sage -f pynac" in a sage3 shell, with a strange 
> failure as result:
> 
> [pynac-0.7.8.p0] checking whether 
> /home/chapoton/sage3/local/var/lib/sage/installed/python3-3.6.1 version is >= 
> 2.7... no
> [pynac-0.7.8.p0] configure: error: Python interpreter is too old
> 
> 
> Le dimanche 6 août 2017 08:51:10 UTC+2, François Bissey a écrit :
> It is probably a correct assertion. What is needed is to set 
> PYTHON 
> to the desired python in spkg-install before calling configure. 
> PYTHON=python3.6 ./sage -f pynac 
> will also probably work in the interim. 
> 
> François 
> 
> > On 6/08/2017, at 18:07, Ralf Stephan <gtr...@gmail.com> wrote: 
> > 
> > The AX_PYTHON_DEVEL apparently finds the wrong Python version 
> > and sets Pynac up for it. 
> > 
> > On Sunday, August 6, 2017 at 7:20:48 AM UTC+2, Ralf Stephan wrote: 
> > 
> > 
> > On Saturday, August 5, 2017 at 1:22:44 PM UTC+2, Frédéric Chapoton 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 calling  PyInt_FromLong from Python2.7 ? 
> > 
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