diff --git a/src/App/ObjectIdentifier.h b/src/App/ObjectIdentifier.h
index ca510482e..4eede9950 100644
--- a/src/App/ObjectIdentifier.h
+++ b/src/App/ObjectIdentifier.h
@@ -160,6 +160,8 @@ public:
 
     ObjectIdentifier(const App::Property & prop);
 
+    virtual ~ObjectIdentifier() {}
+
     // Components
     void addComponent(const Component &c) { components.push_back(c); }
 
diff --git a/src/Mod/Path/libarea/PythonStuff.cpp b/src/Mod/Path/libarea/PythonStuff.cpp
index 1d4487be0..ee9068e6d 100644
--- a/src/Mod/Path/libarea/PythonStuff.cpp
+++ b/src/Mod/Path/libarea/PythonStuff.cpp
@@ -9,6 +9,14 @@
 #include "AreaDxf.h"
 #include "kurve/geometry.h"
 
+#if defined (_POSIX_C_SOURCE)
+#   undef    _POSIX_C_SOURCE
+#endif
+
+#if defined (_XOPEN_SOURCE)
+#   undef    _XOPEN_SOURCE
+#endif
+
 #if _DEBUG
 #undef _DEBUG
 #include <Python.h>
@@ -63,7 +71,11 @@ boost::python::tuple transformed_point(const geoff_geometry::Matrix &matrix, dou
 static void print_curve(const CCurve& c)
 {
 	std::size_t nvertices = c.m_vertices.size();
+#if defined SIZEOF_SIZE_T && SIZEOF_SIZE_T == 4
+	printf("number of vertices = %d\n", nvertices);
+#else
 	printf("number of vertices = %lu\n", nvertices);
+#endif
 	int i = 0;
 	for(std::list<CVertex>::const_iterator It = c.m_vertices.begin(); It != c.m_vertices.end(); It++, i++)
 	{