diff --git a/src/3rdParty/salomesmesh/inc/MED_Common.hxx b/src/3rdParty/salomesmesh/inc/MED_Common.hxx
index 3f80849ba..4f0486441 100644
--- a/src/3rdParty/salomesmesh/inc/MED_Common.hxx
+++ b/src/3rdParty/salomesmesh/inc/MED_Common.hxx
@@ -170,7 +170,7 @@ namespace MED{
   struct TGaussInfo;
   typedef SharedPtr<TGaussInfo> PGaussInfo;
   
-  class TGrilleInfo;
+  struct TGrilleInfo;
   typedef SharedPtr<TGrilleInfo> PGrilleInfo;
 
   struct TTimeStampValueBase;
diff --git a/src/3rdParty/salomesmesh/inc/MED_GaussDef.hxx b/src/3rdParty/salomesmesh/inc/MED_GaussDef.hxx
index b5ef03d79..fc92e83f2 100644
--- a/src/3rdParty/salomesmesh/inc/MED_GaussDef.hxx
+++ b/src/3rdParty/salomesmesh/inc/MED_GaussDef.hxx
@@ -29,7 +29,7 @@
 
 namespace MED
 {
-  class TShapeFun;
+  struct TShapeFun;
   typedef std::vector<double> TDoubleVector;
   /*!
    * \brief Description of family of integration points
diff --git a/src/3rdParty/salomesmesh/inc/SMESH_MAT2d.hxx b/src/3rdParty/salomesmesh/inc/SMESH_MAT2d.hxx
index 985b46549..e52905f77 100644
--- a/src/3rdParty/salomesmesh/inc/SMESH_MAT2d.hxx
+++ b/src/3rdParty/salomesmesh/inc/SMESH_MAT2d.hxx
@@ -45,7 +45,7 @@ namespace SMESH_MAT2d
 {
   class MedialAxis; // MedialAxis is the entry point
   class Branch;
-  class BranchEnd;
+  struct BranchEnd;
   class Boundary;
   struct BoundaryPoint;
 
diff --git a/src/3rdParty/salomesmesh/inc/SMESH_MeshEditor.hxx b/src/3rdParty/salomesmesh/inc/SMESH_MeshEditor.hxx
index e5687475a..76da6c893 100644
--- a/src/3rdParty/salomesmesh/inc/SMESH_MeshEditor.hxx
+++ b/src/3rdParty/salomesmesh/inc/SMESH_MeshEditor.hxx
@@ -51,7 +51,7 @@ class gp_Ax1;
 class gp_Vec;
 class gp_Pnt;
 class SMESH_MesherHelper;
-class SMESH_NodeSearcher;
+struct SMESH_NodeSearcher;
 
 // ============================================================
 /*!
diff --git a/src/3rdParty/salomesmesh/inc/SMESH_subMesh.hxx b/src/3rdParty/salomesmesh/inc/SMESH_subMesh.hxx
index 249784c08..9a51886ed 100644
--- a/src/3rdParty/salomesmesh/inc/SMESH_subMesh.hxx
+++ b/src/3rdParty/salomesmesh/inc/SMESH_subMesh.hxx
@@ -47,7 +47,7 @@ class SMESH_Hypothesis;
 class SMESH_Algo;
 class SMESH_Gen;
 class SMESH_subMeshEventListener;
-class SMESH_subMeshEventListenerData;
+struct SMESH_subMeshEventListenerData;
 class SMESH_subMesh;
 
 typedef SMESH_subMeshEventListener     EventListener;
diff --git a/src/Mod/Path/libarea/PythonStuff.cpp b/src/Mod/Path/libarea/PythonStuff.cpp
index ee9068e6d..6cbe1dc1f 100644
--- a/src/Mod/Path/libarea/PythonStuff.cpp
+++ b/src/Mod/Path/libarea/PythonStuff.cpp
@@ -25,7 +25,7 @@
 #include <Python.h>
 #endif
 
-#ifdef __GNUG__
+#if defined(__GNUG__) && !defined(__APPLE__)
 #pragma implementation
 #endif
 
diff --git a/src/Mod/Path/libarea/kurve/kurve.cpp b/src/Mod/Path/libarea/kurve/kurve.cpp
index 61d096cda..4bfe93e20 100644
--- a/src/Mod/Path/libarea/kurve/kurve.cpp
+++ b/src/Mod/Path/libarea/kurve/kurve.cpp
@@ -570,7 +570,7 @@ return;
 	{
 		// add a span (cw = -1 (T)   acw = 1 (A) )
 #ifdef _DEBUG
-		if(this == NULL) FAILURE(L"Kurve::Add - No Kurve Object");
+		//if(this == NULL) FAILURE(L"Kurve::Add - No Kurve Object");
 #endif
 
 		if(!m_started) {
@@ -676,7 +676,7 @@ return;
 	void Kurve::Replace(int vertexnumber, int type, const Point& p0, const Point& pc, int ID) {
 		// replace a span
 #ifdef _DEBUG
-		if(this == NULL || vertexnumber > m_nVertices) FAILURE(getMessage(L"Kurve::Replace - vertexNumber out of range"));
+		if(vertexnumber > m_nVertices) FAILURE(getMessage(L"Kurve::Replace - vertexNumber out of range"));
 #endif
 		SpanVertex* p = (SpanVertex*) m_spans[vertexnumber / SPANSTORAGE];
 		p->Add(vertexnumber % SPANSTORAGE, type, p0, pc, ID);
@@ -686,20 +686,20 @@ return;
 	void Kurve::ModifyIndex(int vertexnumber, WireExtraData* i) {
 		// replace an index
 #ifdef _DEBUG
-		if(this == NULL || vertexnumber > m_nVertices) FAILURE(getMessage(L"Kurve::ModifyIndex - vertexNumber out of range"));
+		if(vertexnumber > m_nVertices) FAILURE(getMessage(L"Kurve::ModifyIndex - vertexNumber out of range"));
 #endif
 		SpanVertex* p = (SpanVertex*) m_spans[vertexnumber / SPANSTORAGE];
 		p->Add(vertexnumber % SPANSTORAGE, i);
 	}
 #else
 	void Kurve::AddIndex(int vertexNumber, const SpanDataObject* data) {
-		if(this == NULL || vertexNumber > m_nVertices - 1) FAILURE(L"Kurve::AddIndex - vertexNumber out of range");
+		if(vertexNumber > m_nVertices - 1) FAILURE(L"Kurve::AddIndex - vertexNumber out of range");
 		SpanVertex* p = (SpanVertex*) m_spans[vertexNumber / SPANSTORAGE];
 		p->Add(vertexNumber % SPANSTORAGE, data);
 	}
 
 	const SpanDataObject* Kurve::GetIndex(int vertexNumber)const {
-		if(this == NULL || vertexNumber > m_nVertices - 1) FAILURE(L"Kurve::GetIndex - vertexNumber out of range");
+		if(vertexNumber > m_nVertices - 1) FAILURE(L"Kurve::GetIndex - vertexNumber out of range");
 		SpanVertex* p = (SpanVertex*) m_spans[vertexNumber / SPANSTORAGE];
 		return p->GetIndex(vertexNumber % SPANSTORAGE);
 	}