+#define _PC_2_SYMLINKS 15 /* Symlink supported in directory */
+#define _PC_ALLOC_SIZE_MIN 16 /* Minimum storage actually allocated */
+#define _PC_ASYNC_IO 17 /* Async I/O [AIO] supported? */
+#define _PC_FILESIZEBITS 18 /* # of bits to represent file size */
+#define _PC_PRIO_IO 19 /* Priority I/O [PIO] supported? */
+#define _PC_REC_INCR_XFER_SIZE 20 /* Recommended increment for next two */
+#define _PC_REC_MAX_XFER_SIZE 21 /* Recommended max file transfer size */
+#define _PC_REC_MIN_XFER_SIZE 22 /* Recommended min file transfer size */
+#define _PC_REC_XFER_ALIGN 23 /* Recommended buffer alignment */
+#define _PC_SYMLINK_MAX 24 /* Max # of bytes in symlink name */
+#define _PC_SYNC_IO 25 /* Sync I/O [SIO] supported? */
+