configure: C++11 handling for NTL

latte-int / latte

LattE integrale, software for counting lattice points and integration over convex polytopes

https://www.math.ucdavis.edu/~latte/

GNU General Public License v2.0

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Open mkoeppe opened 6 years ago

mkoeppe commented 6 years ago

NTL may be configured with C++11 features. This is the default in NTL 11.

In this case, currently configure does not find NTL. Two options:

Try to find C++11 compiler switches just in case that NTL has been configured as such.
Detect if NTL has been configured with C++11 features, and only then find C++11 compiler switch.