--- antlr_python_runtime-3.1.2/antlr3/recognizers.py.orig	2010-05-01 13:30:01.000000000 +0200
+++ antlr_python_runtime-3.1.2/antlr3/recognizers.py	2010-05-01 13:36:00.000000000 +0200
@@ -164,24 +164,20 @@
         self._state = state
 
         if self.antlr_version > runtime_version:
-            raise RuntimeError(
-                "ANTLR version mismatch: "
-                "The recognizer has been generated by V%s, but this runtime "
-                "is V%s. Please use the V%s runtime or higher."
-                % (self.antlr_version_str,
-                   runtime_version_str,
-                   self.antlr_version_str))
+            print >> sys.stderr, """ 
+            WARNING: ANTLR version mismatch: 
+            The recognizer has been generated by V%s, but this runtime 
+            is V%s, this may not work correctly. Please use the V%s runtime or higher.""" % (
+            self.antlr_version_str, runtime_version_str, self.antlr_version_str)
         elif (self.antlr_version < (3, 1, 0, 0) and
               self.antlr_version != runtime_version):
             # FIXME: make the runtime compatible with 3.0.1 codegen
             # and remove this block.
-            raise RuntimeError(
-                "ANTLR version mismatch: "
-                "The recognizer has been generated by V%s, but this runtime "
-                "is V%s. Please use the V%s runtime."
-                % (self.antlr_version_str,
-                   runtime_version_str,
-                   self.antlr_version_str))
+            print >> sys.stderr, """
+            WARNING ANTLR version mismatch: 
+            The recognizer has been generated by V%s, but this runtime 
+            is V%s, this may not work correctly. Please use the V%s runtime.""" % (
+            self.antlr_version_str, runtime_version_str, self.antlr_version_str)
 
     # this one only exists to shut up pylint :(
     def setInput(self, input):