Hi, confirmed in a current sid chroot. Perhaps this package should be added to at least one of those lists:
https://bugs.debian.org/cgi-bin/pkgreport.cgi?tag=libstdc++-cxx11;users=debian-...@lists.debian.org https://bugs.debian.org/cgi-bin/pkgreport.cgi?tag=ftbfs-gcc-5;users=debian-...@lists.debian.org ... and the severity adjusted? (see the recent messages about this transition on debian-devel-announce) Cheers, -- intrigeri