Add minimal interface to symtable: _symtable module.
diff --git a/setup.py b/setup.py
index 1c1ec13..bd74ab4 100644
--- a/setup.py
+++ b/setup.py
@@ -154,6 +154,7 @@
         exts.append( Extension('pcre', ['pcremodule.c', 'pypcre.c']) )
 
         exts.append( Extension('_weakref', ['_weakref.c']) )
+        exts.append( Extension('_symtable', ['symtablemodule.c']) )
         exts.append( Extension('xreadlines', ['xreadlinesmodule.c']) )
 
         # array objects