With threads enabled NTL includes c++11 headers that then get included in 
singular:
https://bugs.gentoo.org/show_bug.cgi?id=572626

> On 13/03/2016, at 22:55, Volker Braun <vbraun.n...@gmail.com> wrote:
> 
> Surely we can compile singular with different cflags than NTL? Or is it a 
> linking problem?
> 
> 
> On Sunday, March 13, 2016 at 2:17:15 AM UTC+1, François wrote:
> Thanks for adding a way to make binaries without avx/fma. 
> 
> The threading unfortunately requires C++11 (unless it changed). 
> In turns the inclusion of c++11 flags breaks the building of the 
> singular version shipped in sage. I don’t know about singular 4 
> but it wouldn’t surprise me if it did too. 
> 
> François 
> 
> > On 13/03/2016, at 10:32, Victor Shoup <sh...@cs.nyu.edu> wrote: 
> > 
> > Just released a new version of NTL! 
> > In a nutshell: faster, better matrix arithmetic over zz_p (small moduli), 
> > some improved thread pooling facilities, 
> > and several other small improvements. 
> > 
> > For more details, go here: http://shoup.net/ntl/doc/tour-changes.html 
> > 
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