If you read that trac ticket symbols defined in ntl change depending on the version
of gcc. It is all about how you deal with c++ templates by default. The options
you are using are no doubt part f the mix. Although graphite is unlikely to
be the problem here, more likely lto.

You could try to emerge singular with CXXFLAGS=-fimplicit-template
not sure that will work without a patch.

François

> On 16/11/2014, at 00:18, Jeramia Poland <jeramia.poland@gmail.com> wrote:
>
> I have ntl-6.1.0 installed.  I can wait til Monday; I'm surprised it might be an actual issue and not something I've done to myself.
>
> Jeramia
>
> On Sat, Nov 15, 2014 at 4:42 AM, François Bissey <frp.bissey@gmail.com> wrote:
> It looks very similar to http://trac.sagemath.org/ticket/16882#comment:29.
> Which version of ntl have you emerged? you should keep clear of the latest
> version of ntl.
>
> I cannot do much in terms of fix until Monday. My main dev machine is at
> work and it looks like we had another power cut and it is now off.
>
> François
>