+#ifndef UNIFDEF_DRIVERKIT
+#if (__DARWIN_C_LEVEL >= __DARWIN_C_FULL) || \
+ (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
+ (defined(__cplusplus) && __cplusplus >= 201703L)
+/* ISO/IEC 9899:201x 7.27.2.5 The timespec_get function */
+#define TIME_UTC 1 /* time elapsed since epoch */
+__API_AVAILABLE(macosx(10.15), ios(13.0), tvos(13.0), watchos(6.0))
+int timespec_get(struct timespec *ts, int base);
+#endif
+
+#endif /* UNIFDEF_DRIVERKIT */