Build fails on MacOS Sierra

[sudoankit]

When make is called in the project directory the build fails with this error:

In file included from /Users/sudoankit/root/RooUnfold-master/tmp/macosx64/RooUnfoldMap_LinkDef.cxx:1:
In file included from /usr/local/Cellar/root6/6.06.08/include/root/TObject.h:31:
In file included from /usr/local/Cellar/root6/6.06.08/include/root/Rtypes.h:37:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/atomic:543:2: error:
      <atomic> is not implemented
#error <atomic> is not implemented
 ^
1 error generated.
make: *** [/Users/sudoankit/root/RooUnfold-master/libRooUnfold.rootmap] Error 1

I believe this is because clang++ or g++ with -std=c++11 flags is not called.

[sudoankit]

This is fixed by this SVN repo.
[REPO LINK ](https://svnsrv.desy.de/public/unfolding/RooUnfold/trunk RooUnfold)

[sudoankit]

Should I PR the SVN repository to this repository?