--- grass-6.4.5/lib/python/ctypes/ctypesgencore/parser/cgrammar.py.orig	2016-04-02 20:36:44.203067400 +0200
+++ grass-6.4.5/lib/python/ctypes/ctypesgencore/parser/cgrammar.py	2016-04-02 09:42:23.508048350 +0200
@@ -1080,7 +1080,7 @@
         p[0] = p[1]
 
 def p_error(t):
-    if t.lexer.in_define:
+    if t.lexer.in_define or t.type == 'PP_END_DEFINE':
         # p_define_error will generate an error message.
         pass
     else: