--- a/src/java.base/share/native/libnet/net_util.h	Thu Apr 25 18:41:52 2019 -0400
+++ b/src/java.base/share/native/libnet/net_util.h	Tue Apr 16 13:16:49 2019 -0700
@@ -126,6 +126,7 @@
 
 jfieldID NET_GetFileDescriptorID(JNIEnv *env);
 
+JNIEXPORT jint JNICALL ipv4_available();
 JNIEXPORT jint JNICALL ipv6_available();
 
 JNIEXPORT jint JNICALL reuseport_available();