--- liblightdm-gobject/Makefile.in.orig	2013-04-15 23:50:58.760043808 +0200
+++ liblightdm-gobject/Makefile.in	2013-04-15 23:51:10.967119526 +0200
@@ -372,11 +372,11 @@ liblightdm_gobject_1_la_SOURCES = \
 	user.c \
 	$(liblightdm_gobject_1include_HEADERS)
 
-@HAVE_INTROSPECTION_TRUE@INTROSPECTION_SCANNER_ARGS = --add-include-path=$(srcdir) --warn-all
+@HAVE_INTROSPECTION_TRUE@INTROSPECTION_SCANNER_ARGS = --add-include-path=$(srcdir) --warn-all --symbol-prefix=lightdm
 @HAVE_INTROSPECTION_TRUE@INTROSPECTION_COMPILER_ARGS = --includedir=$(srcdir)
 @HAVE_INTROSPECTION_TRUE@INTROSPECTION_GIRS = LightDM-1.gir
 @HAVE_INTROSPECTION_TRUE@LightDM_1_gir_INCLUDES = GObject-2.0
-@HAVE_INTROSPECTION_TRUE@LightDM_1_gir_CFLAGS = $(INCLUDES) --symbol-prefix=lightdm
+@HAVE_INTROSPECTION_TRUE@LightDM_1_gir_CFLAGS = $(INCLUDES)
 @HAVE_INTROSPECTION_TRUE@LightDM_1_gir_LIBS = liblightdm-gobject-1.la
 @HAVE_INTROSPECTION_TRUE@LightDM_1_gir_FILES = $(liblightdm_gobject_1_la_SOURCES)
 @HAVE_INTROSPECTION_TRUE@girdir = $(datadir)/gir-1.0