diff -r ff7655b93101 -r aa516a7cf95e src/java.base/unix/native/libnet/net_util_md.h
--- a/src/java.base/unix/native/libnet/net_util_md.h	Thu Nov 21 17:51:11 2019 +0000
+++ b/src/java.base/unix/native/libnet/net_util_md.h	Mon Nov 25 15:16:29 2019 +0000
@@ -101,10 +101,6 @@
                                   const char *defaultDetail);
 void NET_SetTrafficClass(SOCKETADDRESS *sa, int trafficClass);
 
-#ifdef __linux__
-int kernelIsV24();
-#endif
-
 #ifdef __solaris__
 int net_getParam(char *driver, char *param);
 #endif