https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69470
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Vedran Miletic from comment #1) > Happens when building ns-3 [1] too. > > [1016/2462] Compiling src/wifi/model/wifi-mac-queue.cc > In file included from ./ns3/test.h:24:0, > from ../src/spectrum/test/tv-helper-distribution-test.cc:23: > /usr/include/c++/6.0.0/sstream:300:7: error: ‘struct > std::__cxx11::basic_stringbuf<_CharT, _Traits, _Alloc>::__xfer_bufptrs’ > redeclared with different access > struct __xfer_bufptrs > ^~~~~~ That was a different bug, not related to concepts.
