-/* HAS_MSG_CTRUNC:
- * This symbol, if defined, indicates that the MSG_CTRUNC is supported.
- * Checking just with #ifdef might not be enough because this symbol
- * has been known to be an enum.
- */
-/* HAS_MSG_DONTROUTE:
- * This symbol, if defined, indicates that the MSG_DONTROUTE is supported.
- * Checking just with #ifdef might not be enough because this symbol
- * has been known to be an enum.
- */
-/* HAS_MSG_OOB:
- * This symbol, if defined, indicates that the MSG_OOB is supported.
- * Checking just with #ifdef might not be enough because this symbol
- * has been known to be an enum.
- */
-/* HAS_MSG_PEEK:
- * This symbol, if defined, indicates that the MSG_PEEK is supported.
- * Checking just with #ifdef might not be enough because this symbol
- * has been known to be an enum.
- */
-/* HAS_MSG_PROXY:
- * This symbol, if defined, indicates that the MSG_PROXY is supported.
- * Checking just with #ifdef might not be enough because this symbol
- * has been known to be an enum.
- */
-/* HAS_SCM_RIGHTS:
- * This symbol, if defined, indicates that the SCM_RIGHTS is supported.
- * Checking just with #ifdef might not be enough because this symbol
- * has been known to be an enum.
- */