diff -rupN old/tmva/pymva/inc/TMVA/PyMethodBase.h root-6.06.06/tmva/pymva/inc/TMVA/PyMethodBase.h
--- old/tmva/pymva/inc/TMVA/PyMethodBase.h	2016-07-06 18:36:49.000000000 +0200
+++ root-6.06.06/tmva/pymva/inc/TMVA/PyMethodBase.h	2016-08-05 13:56:31.839179271 +0200
@@ -81,7 +81,7 @@ namespace TMVA {
       // default destructur
       virtual ~PyMethodBase();
       //basic python related function
-      static void PyInitialize();
+      static void *PyInitialize();
       static int  PyIsInitialized();
       static void PyFinalize();
       static void PySetProgramName(TString name);
diff -rupN old/tmva/pymva/src/PyMethodBase.cxx root-6.06.06/tmva/pymva/src/PyMethodBase.cxx
--- old/tmva/pymva/src/PyMethodBase.cxx	2016-07-06 18:36:49.000000000 +0200
+++ root-6.06.06/tmva/pymva/src/PyMethodBase.cxx	2016-08-05 14:07:21.225701275 +0200
@@ -82,7 +82,7 @@ PyObject *PyMethodBase::Eval(TString cod
 }
 
 //_______________________________________________________________________
-void PyMethodBase::PyInitialize()
+void *PyMethodBase::PyInitialize()
 {
    TMVA::MsgLogger Log;
    if (!PyIsInitialized()) {
@@ -149,7 +149,7 @@ void PyMethodBase::PyInitialize()
    Py_DECREF(pName);
    Py_DECREF(pDict);
 
-
+   return NULL;
 }
 
 //_______________________________________________________________________