Defined in 4 files as a macro:
- contrib/ntp/sntp/libevent/compat/sys/queue.h, line 231 (as a macro)
- crypto/openssh/openbsd-compat/sys-queue.h, line 352 (as a macro)
- sbin/pfctl/pfctl_parser.h, line 189 (as a macro)
- sys/dev/ubsec/ubsec.c, line 89 (as a macro)