Does not effect Seamonkey builds.

Try to get thunderbird going on the Mac. Include TK_LIBS.

Thanks to macrxnapa for the patch.

mailnews/build/Makefile.in

@@ -122,6 +122,10 @@ EXTRA_DSO_LDOPTS = \
 		$(MOZ_XPCOM_OBSOLETE_LIBS) \
 		$(NULL)
 
+ifneq (,$(filter mac cocoa,$(MOZ_WIDGET_TOOLKIT)))
+		EXTRA_DSO_LDOPTS += $(TK_LIBS)
+endif 
+
 LOCAL_INCLUDES = -I$(srcdir) \
                  -I$(srcdir)/../base/src \
                  -I$(srcdir)/../local/src \