+A(_POSIX2_C_BIND >= 200809L)
+// not required by the standard
+ A(_POSIX_ADVISORY_INFO >= 0)
+ A(_POSIX_CPUTIME >= 0)
+ A(_POSIX_FSYNC >= 0)
+ A(_POSIX_IPV6 >= 0)
+ A(_POSIX_MEMLOCK >= 0)
+ A(_POSIX_MEMLOCK_RANGE >= 0)
+ A(_POSIX_MESSAGE_PASSING >= 0)
+ A(_POSIX_MONOTONIC_CLOCK >= 0)
+// A(_POSIX_PRIORITIZED_IO >= 0)
+// A(_POSIX_PRIORITY_SCHEDULING >= 0)
+ A(_POSIX_RAW_SOCKETS >= 0)
+// A(_POSIX_SHARED_MEMORY_OBJECTS >= 0)
+ A(_POSIX_SPAWN >= 0)
+// A(_POSIX_SPORADIC_SERVER >= 0)
+// A(_POSIX_SYNCHRONIZED_IO >= 0)
+ A(_POSIX_THREAD_ATTR_STACKADDR >= 0)
+ A(_POSIX_THREAD_ATTR_STACKSIZE >= 0)
+ A(_POSIX_THREAD_CPUTIME >= 0)
+// A(_POSIX_THREAD_PRIO_INHERIT >= 0)
+// A(_POSIX_THREAD_PRIO_PROTECT >= 0)
+ A(_POSIX_THREAD_PRIORITY_SCHEDULING >= 0)
+ A(_POSIX_THREAD_PROCESS_SHARED >= 0)
+// A(_POSIX_THREAD_ROBUST_PRIO_INHERIT >= 0)
+// A(_POSIX_THREAD_ROBUST_PRIO_PROTECT >= 0)
+// A(_POSIX_THREAD_SPORADIC_SERVER >= 0)
+// A(_POSIX_TYPED_MEMORY_OBJECTS >= 0)