--- src/VBox/Additions/linux/lightdm-greeter/vbox-greeter.cpp.orig	2016-10-24 22:48:30.177292847 +0200
+++ src/VBox/Additions/linux/lightdm-greeter/vbox-greeter.cpp	2016-10-24 22:53:43.351327894 +0200
@@ -394,7 +394,11 @@
 #endif
                            pszDomain);
             /* Trigger LightDM authentication with the user name just retrieved. */
+#ifdef HAVE_LIBLIGHTDMGOBJECT_1_19_2
+            lightdm_greeter_authenticate(pCtx->pGreeter, pszUsername, NULL); /* Must be the real user name from host! */
+#else
             lightdm_greeter_authenticate(pCtx->pGreeter, pszUsername); /* Must be the real user name from host! */
+#endif
 
             /* Securely wipe the user name + domain again. */
             VbglR3CredentialsDestroy(pszUsername, NULL /* pszPassword */, pszDomain,
@@ -448,7 +452,11 @@
         {
             if (pCtx->pszPassword)
             {
+#ifdef HAVE_LIBLIGHTDMGOBJECT_1_19_2
+                lightdm_greeter_respond(pGreeter, pCtx->pszPassword, NULL);
+#else
                 lightdm_greeter_respond(pGreeter, pCtx->pszPassword);
+#endif
             }
             else
             {
@@ -460,7 +468,11 @@
                 AssertPtr(pEdtPwd);
                 const gchar *pszPwd = gtk_entry_get_text(pEdtPwd);
 #endif
+#ifdef HAVE_LIBLIGHTDMGOBJECT_1_19_2
+                lightdm_greeter_respond(pGreeter, pszPwd, NULL);
+#else
                 lightdm_greeter_respond(pGreeter, pszPwd);
+#endif
             }
             break;
         }
@@ -587,8 +599,13 @@
 #endif
     if (strlen(pszUser)) /* Only authenticate if username is given. */
     {
+#ifdef HAVE_LIBLIGHTDMGOBJECT_1_19_2
+        lightdm_greeter_respond(pCtx->pGreeter, pszPwd, NULL);
+        lightdm_greeter_authenticate(pCtx->pGreeter, pszUser, NULL);
+#else
         lightdm_greeter_respond(pCtx->pGreeter, pszPwd);
         lightdm_greeter_authenticate(pCtx->pGreeter, pszUser);
+#endif
     }
 }
 
--- src/VBox/Additions/linux/lightdm-greeter/Makefile.kmk.orig	2016-10-24 23:14:30.007548938 +0200
+++ src/VBox/Additions/linux/lightdm-greeter/Makefile.kmk	2016-10-24 23:16:23.902737037 +0200
@@ -48,7 +48,7 @@
  	GTK_DISABLE_SINGLE_INCLUDES \
  	GDK_DISABLE_DEPRECATED
 endif
-vbox-greeter_CFLAGS  := $(if $(VBOX_OSE),$(filter-out -I%,$(shell pkg-config --cflags liblightdm-gobject-1)),)
+vbox-greeter_CXXFLAGS  := $(if $(VBOX_OSE),$(filter-out -I%,$(shell pkg-config --cflags liblightdm-gobject-1)),) $(if $(shell pkg-config --exists 'liblightdm-gobject-1 >= 1.19.2' && echo 1),-DHAVE_LIBLIGHTDMGOBJECT_1_19_2,)
 ## @todo r=bird: Why are we cooking our own lightdm-gobject-1 but using system headers?
 ##               That sounds like a very risky business to me.  I've added  liblightdm-gobject-1.5.0
 ##               to the INCS, however lightdm.h is missing and will be taken from the system.