$ ldd /usr/sbin/named | grep -i thread libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f6495778000)
$ ldd /usr/sbin/named | grep -i thread 64-linux- gnu/libpthread. so.0 (0x00007f649577 8000)
libpthread.so.0 => /lib/x86_