--- toolkit/library/Makefile.in.orig	2010-01-11 12:13:08.000000000 -0500
+++ toolkit/library/Makefile.in	2010-01-11 12:15:05.000000000 -0500
@@ -181,7 +181,7 @@
 export:: $(RDF_UTIL_SRC_CPPSRCS) $(INTL_UNICHARUTIL_UTIL_CPPSRCS)
 	$(INSTALL) $^ .
 
-EXTRA_DSO_LDOPTS += $(LIBS_DIR) $(EXTRA_DSO_LIBS)
+EXTRA_DSO_LDOPTS += -Wl,--warn-unresolved-symbols -Wl,--as-needed $(LIBS_DIR) $(EXTRA_DSO_LIBS)
 
 ifdef MOZ_ENABLE_LIBXUL
 include $(srcdir)/libxul-rules.mk