Many configure checks fail with
In file included from conftest.cc:38:
In file included from /usr/include/c++/v1/ext/hash_map:203:
In file included from /usr/include/c++/v1/__hash_table:16:
In file included from /usr/include/c++/v1/memory:653:
In file included from /usr/include/c++/v1/typeinfo:61:
In file included from /usr/include/c++/v1/exception:82:
In file included from /usr/include/c++/v1/cstdlib:86:
In file included from /usr/include/c++/v1/stdlib.h:94:
/usr/include/stdlib.h:97:1: error: function declared '[[noreturn]]' after its first declaration
_Noreturn void exit(int);
^
/usr/include/sys/cdefs.h:280:22: note: expanded from macro '_Noreturn'
#define _Noreturn [[noreturn]]
^
http://beefy11.nyi.freebsd.org/data/head-i386-default/p477696_s338122/logs/errors/nget-0.27.1_5.log
5f21b44ebc