diff --git a/CMakeLists.txt b/CMakeLists.txt
index 16fa668b..0123686b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -76,6 +76,7 @@ endif()
 find_package (Python3 COMPONENTS Interpreter Development NumPy REQUIRED)
 include_directories(${Python3_INCLUDE_DIRS})
 message(STATUS "Python version : " ${Python3_VERSION})
+message(STATUS "Python executable : " ${Python3_EXECUTABLE})
 message(STATUS "Python lib : " ${Python3_LIBRARIES})
 
 # --- Libraries
diff --git a/src/cpp/plantgl/algo/codec/vrmlprinter.h b/src/cpp/plantgl/algo/codec/vrmlprinter.h
index 29a7338b..53f1db00 100644
--- a/src/cpp/plantgl/algo/codec/vrmlprinter.h
+++ b/src/cpp/plantgl/algo/codec/vrmlprinter.h
@@ -68,7 +68,7 @@ typedef RCPtr<Appearance> AppearancePtr;
 
 /// struct for testing equality of 2 pairs
 
-#ifndef WIN32_STL_EXTENSION
+#ifdef USING_UNORDERED_MAP
 
 template <class type>
 struct eqpair
@@ -94,7 +94,9 @@ struct hashpair
 /// hash set of pairs
 typedef pgl_hash_set<std::pair< uint_t, uint_t>,hashpair<uint_t>,eqpair<uint_t> > SCache;
 
+
 #else
+#ifdef WIN32_STL_EXTENSION
 
 template <class type>
 struct less_pair
@@ -107,7 +109,7 @@ struct less_pair
 
 
 template <class type>
-struct hash_comp_pair : STDEXT::hash_compare<std::pair<type,type>,less_pair<type> >
+struct hash_comp_pair : pgl_hash<std::pair<type,type>,less_pair<type> >
 {
 
   size_t operator()(const std::pair<type,type>& a) const
@@ -120,12 +122,13 @@ struct hash_comp_pair : STDEXT::hash_compare<std::pair<type,type>,less_pair<type
     return ((a.first < b.first)||(a.second < b.second));
   }
 
-  STDEXT::hash_compare<type> H;
+  pgl_hash<type> H;
 };
 
 typedef pgl_hash_set<std::pair< uint_t, uint_t>, hash_comp_pair<uint_t> > SCache;
 
 #endif
+#endif
 
 
 /**
diff --git a/src/cpp/plantgl/gui/base/application.cpp b/src/cpp/plantgl/gui/base/application.cpp
index 2f6216bd..77043847 100644
--- a/src/cpp/plantgl/gui/base/application.cpp
+++ b/src/cpp/plantgl/gui/base/application.cpp
@@ -86,7 +86,7 @@ static bool DestroyedAppli = false;
 void initViewerAppli(){
     if(VIEWER_APPLI == NULL){
 #ifdef QT_THREAD_SUPPORT
-        if(qApp == NULL && MODE){
+        if((qApp == NULL && QApplication::instance() == NULL) && MODE){
             if(!DestroyedAppli)
                 VIEWER_APPLI = new ViewerThreadedAppli();
             else
diff --git a/src/cpp/plantgl/tool/util_hashmap.h b/src/cpp/plantgl/tool/util_hashmap.h
index 350fbdf6..d691101e 100644
--- a/src/cpp/plantgl/tool/util_hashmap.h
+++ b/src/cpp/plantgl/tool/util_hashmap.h
@@ -71,7 +71,7 @@
 	#endif
 #endif
 
-
+#include <string>
 
 template <class T>
 struct pgl_hash_map_string : public pgl_hash_map<std::string, T >{};
diff --git a/src/cpp/plantgl/tool/util_hashset.h b/src/cpp/plantgl/tool/util_hashset.h
index 16665095..30a7237c 100644
--- a/src/cpp/plantgl/tool/util_hashset.h
+++ b/src/cpp/plantgl/tool/util_hashset.h
@@ -71,6 +71,7 @@
 	#endif
 #endif
 
+#include <string>
 
 typedef pgl_hash_set<std::string> pgl_hash_set_string ;
 typedef pgl_hash_set<uint_t> pgl_hash_set_uint32;
diff --git a/src/cpp/plantgl/version.h b/src/cpp/plantgl/version.h
index 7d52dbe9..1f054978 100644
--- a/src/cpp/plantgl/version.h
+++ b/src/cpp/plantgl/version.h
@@ -48,7 +48,7 @@
 #define __plantgl_version_h__
 
 /// PGL Version macro
-#define PGL_VERSION 0x031501
+#define PGL_VERSION 0x031502
 
 #endif