Missed this part in the last commit
gdbus-daemon-generated.h gdbus-daemon-generated.c : dbus-daemon.xml $(srcdir)/gdbus-2.0/codegen/gdbus-codegen.in
$(AM_V_GEN) UNINSTALLED_GLIB_SRCDIR=$(top_srcdir) \
UNINSTALLED_GLIB_BUILDDIR=$(top_builddir) \
- $(PYTHON) $(top_builddir)/gio/gdbus-2.0/codegen/gdbus-codegen.in \
+ $(PYTHON) $(top_srcdir)/gio/gdbus-2.0/codegen/gdbus-codegen.in \
--interface-prefix org. \
--generate-c-code gdbus-daemon-generated \
--c-namespace _G \