Index: VirtualBox-5.1.30/src/VBox/Runtime/r0drv/linux/waitqueue-r0drv-linux.h
===================================================================
--- VirtualBox-5.1.30.orig/src/VBox/Runtime/r0drv/linux/waitqueue-r0drv-linux.h
+++ VirtualBox-5.1.30/src/VBox/Runtime/r0drv/linux/waitqueue-r0drv-linux.h
@@ -46,7 +46,7 @@
 typedef struct RTR0SEMLNXWAIT
 {
     /** The wait queue entry. */
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 13, 0)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0)
     wait_queue_entry_t WaitQE;
 #else
     wait_queue_t    WaitQE;
Index: VirtualBox-5.1.28/src/VBox/HostDrivers/VBoxNetFlt/linux/VBoxNetFlt-linux.c
===================================================================
--- VirtualBox-5.1.28.orig/src/VBox/HostDrivers/VBoxNetFlt/linux/VBoxNetFlt-linux.c
+++ VirtualBox-5.1.28/src/VBox/HostDrivers/VBoxNetFlt/linux/VBoxNetFlt-linux.c
@@ -124,6 +124,10 @@ typedef struct VBOXNETFLTNOTIFIER *PVBOX
 #  define bstats stats
 #  define qstats stats
 # endif
+#endif 
+
+# if 1
+#define SKB_GSO_UDP	0
 #endif
 
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 20, 0)
@@ -722,9 +726,11 @@ static struct sk_buff *vboxNetFltLinuxSk
         case PDMNETWORKGSOTYPE_IPV4_TCP:
             fGsoType = SKB_GSO_TCPV4;
             break;
+# if 1
         case PDMNETWORKGSOTYPE_IPV4_UDP:
             fGsoType = SKB_GSO_UDP;
             break;
+#endif
         case PDMNETWORKGSOTYPE_IPV6_TCP:
             fGsoType = SKB_GSO_TCPV6;
             break;