diff -r 6ba3d8d41135 -r fb1d9bf1be2b src/java.base/unix/native/libnet/net_util_md.h
--- a/src/java.base/unix/native/libnet/net_util_md.h	Mon Nov 25 09:10:41 2019 +0000
+++ b/src/java.base/unix/native/libnet/net_util_md.h	Fri Nov 22 10:29:12 2019 +0100
@@ -98,10 +98,6 @@
                                   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