Bug 328516: attempt to get AIX building again.

layout/build/Makefile.in

@@ -241,6 +241,11 @@ EXTRA_DSO_LDOPTS += \
 	$(NULL)
 endif
 
+# Add explicit X11 dependency when building against X11 toolkits
+ifneq (,$(filter gtk gtk2 qt xlib,$(MOZ_WIDGET_TOOLKIT)))
+EXTRA_DSO_LDOPTS += $(XLDFLAGS) $(XLIBS)
+endif
+
 include $(topsrcdir)/config/rules.mk
 
 LOCAL_INCLUDES	+= -I$(srcdir)/../base \