diff --git a/include/opencv2/opencv.hpp b/include/opencv2/opencv.hpp
index 3c2f414fe7..4d1c2afdab 100644
--- a/include/opencv2/opencv.hpp
+++ b/include/opencv2/opencv.hpp
@@ -45,12 +45,10 @@
 
 #include "opencv2/core/core_c.h"
 #include "opencv2/core/core.hpp"
-#include "opencv2/core/wimage.hpp"
 #include "opencv2/flann/flann.hpp"
 #include "opencv2/imgproc/imgproc_c.h"
 #include "opencv2/imgproc/imgproc.hpp"
 #include "opencv2/video/tracking.hpp"
-#include "opencv2/video/blobtrack.hpp"
 #include "opencv2/video/background_segm.hpp"
 #include "opencv2/features2d/features2d.hpp"
 #include "opencv2/objdetect/objdetect.hpp"
diff --git a/modules/core/include/opencv2/core/mat.hpp b/modules/core/include/opencv2/core/mat.hpp
index 80febfee04..367a61b793 100644
--- a/modules/core/include/opencv2/core/mat.hpp
+++ b/modules/core/include/opencv2/core/mat.hpp
@@ -757,7 +757,7 @@ SVD::backSubst( const Matx<_Tp, nm, 1>& w, const Matx<_Tp, m, nm>& u,
                 Matx<_Tp, n, nb>& dst )
 {
     assert( nm == MIN(m, n));
-    Mat _u(u, false), _w(w, false), _vt(vt, false), _rhs(_rhs, false), _dst(dst, false);
+    Mat _u(u, false), _w(w, false), _vt(vt, false), _rhs(rhs, false), _dst(dst, false);
     SVD::backSubst(_w, _u, _vt, _rhs, _dst);
     CV_Assert(_dst.data == (uchar*)&dst.val[0]);
 }
diff --git a/samples/cpp/camshiftdemo.cpp b/samples/cpp/camshiftdemo.cpp
index 02d741dce8..dc321808ad 100644
--- a/samples/cpp/camshiftdemo.cpp
+++ b/samples/cpp/camshiftdemo.cpp
@@ -50,7 +50,6 @@ int main( int argc, char** argv )
     VideoCapture cap;
     Rect trackWindow;
     RotatedRect trackBox;
-    CvConnectedComp trackComp;
     int hsize = 16;
     float hranges[] = {0,180};
     const float* phranges = hranges;
diff --git a/samples/cpp/lkdemo.cpp b/samples/cpp/lkdemo.cpp
index a482656e71..4030a2a7bd 100644
--- a/samples/cpp/lkdemo.cpp
+++ b/samples/cpp/lkdemo.cpp
@@ -106,7 +106,7 @@ int main( int argc, char** argv )
             points[1].resize(k);
         }
 
-        if( addRemovePt && points[1].size() < MAX_COUNT )
+        if( addRemovePt && points[1].size() < (size_t)MAX_COUNT )
         {
             vector<Point2f> tmp;
             tmp.push_back(pt);