diff -up ./src/Makefile.am.orig ./src/Makefile.am
--- ./src/Makefile.am.orig	2013-04-01 13:23:40.899157850 +0000
+++ ./src/Makefile.am	2013-04-01 13:23:59.336501141 +0000
@@ -8,8 +8,13 @@ lightdm_gtk_greeter_CFLAGS = \
 	-DLOCALEDIR=\""$(localedir)"\" \
 	-DGREETER_DATA_DIR=\""$(datadir)/lightdm-gtk-greeter"\" \
 	-DCONFIG_FILE=\""$(sysconfdir)/lightdm/lightdm-gtk-greeter.conf"\" \
-	$(GREETER_CFLAGS) \
-	$(WARN_CFLAGS)
+        $(GTK_CFLAGS) \
+        $(GREETER_CFLAGS) \
+        $(LIGHTDMGOBJECT_CFLAGS) \
+        $(WARN_CFLAGS)
 
 lightdm_gtk_greeter_LDADD = \
-	$(GREETER_LIBS)
+        $(GREETER_LIBS) \
+        $(GTK_LIBS) \
+        $(LIGHTDMGOBJECT_LIBS) \
+        $(LIBX11_LIBS)