Fix from opensuse:
https://build.opensuse.org/package/view_file/Virtualization/virtualbox/Fix_for_server_1.19.patch

https://bugs.gentoo.org/602784

Index: VirtualBox-5.1.10/src/VBox/Additions/x11/vboxvideo/vboxvideo.h
===================================================================
--- VirtualBox-5.1.10.orig/src/VBox/Additions/x11/vboxvideo/vboxvideo.h
+++ VirtualBox-5.1.10/src/VBox/Additions/x11/vboxvideo/vboxvideo.h
@@ -52,6 +52,10 @@
 #ifndef _VBOXVIDEO_H_
 #define _VBOXVIDEO_H_
 
+#if XORG_VERSION_CURRENT >= 11900000
+#include <bits/sigset.h>
+typedef __sigset_t sigset_t;
+#endif
 #include <VBox/VBoxVideoGuest.h>
 #include <VBox/VBoxVideo.h>
 #include "version-generated.h"
Index: VirtualBox-5.1.10/src/VBox/Additions/x11/vboxvideo/helpers.c
===================================================================
--- VirtualBox-5.1.10.orig/src/VBox/Additions/x11/vboxvideo/helpers.c
+++ VirtualBox-5.1.10/src/VBox/Additions/x11/vboxvideo/helpers.c
@@ -82,7 +82,11 @@ void vbvxSetIntegerPropery(ScrnInfoPtr p
 
     property_name = MakeAtom(pszName, strlen(pszName), TRUE);
     VBVXASSERT(property_name != BAD_RESOURCE, ("Failed to set atom \"%s\"\n", pszName));
+#if XORG_VERSION_CURRENT >= 11900000
+    dixChangeWindowProperty(serverClient, ROOT_WINDOW(pScrn), property_name, XA_INTEGER, 32, PropModeReplace, cData, paData, fSendEvent);
+#else
     ChangeWindowProperty(ROOT_WINDOW(pScrn), property_name, XA_INTEGER, 32, PropModeReplace, cData, paData, fSendEvent);
+#endif
 }
 
 void vbvxReprobeCursor(ScrnInfoPtr pScrn)
Index: VirtualBox-5.1.10/src/VBox/Additions/x11/vboxvideo/vboxvideo.c
===================================================================
--- VirtualBox-5.1.10.orig/src/VBox/Additions/x11/vboxvideo/vboxvideo.c
+++ VirtualBox-5.1.10/src/VBox/Additions/x11/vboxvideo/vboxvideo.c
@@ -1229,7 +1229,11 @@ static Bool VBOXScreenInit(ScreenPtr pSc
     updateGraphicsCapability(pScrn, TRUE);
 
     /* Register block and wake-up handlers for getting new screen size hints. */
+#if XORG_VERSION_CURRENT >= 11900000
+    RegisterBlockAndWakeupHandlers(vboxBlockHandler, (ServerWakeupHandlerProcPtr)NoopDDA, (pointer)pScrn);
+#else
     RegisterBlockAndWakeupHandlers(vboxBlockHandler, (WakeupHandlerProcPtr)NoopDDA, (pointer)pScrn);
+#endif
 
     /* software cursor */
     miDCInitialize(pScreen, xf86GetPointerScreenFuncs());
Index: VirtualBox-5.1.10/src/VBox/Additions/x11/vboxvideo/pointer.c
===================================================================
--- VirtualBox-5.1.10.orig/src/VBox/Additions/x11/vboxvideo/pointer.c
+++ VirtualBox-5.1.10/src/VBox/Additions/x11/vboxvideo/pointer.c
@@ -15,6 +15,10 @@
  * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
  */
 
+#if XORG_VERSION_CURRENT >= 11900000
+#include <bits/sigset.h>
+typedef __sigset_t sigset_t;
+#endif
 #include <VBox/VBoxGuestLib.h>
 
 #ifndef PCIACCESS
Index: VirtualBox-5.1.10/src/VBox/Additions/x11/vboxvideo/edid.c
===================================================================
--- VirtualBox-5.1.10.orig/src/VBox/Additions/x11/vboxvideo/edid.c
+++ VirtualBox-5.1.10/src/VBox/Additions/x11/vboxvideo/edid.c
@@ -44,6 +44,10 @@
  *    Dave Airlie <airlied@redhat.com>
  */
 
+#if XORG_VERSION_CURRENT >= 11900000
+#include <bits/sigset.h>
+typedef __sigset_t sigset_t;
+#endif
 #include <misc.h>
 #include <xf86DDC.h>
 #include <xf86Crtc.h>