diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6a01cce..3c317a2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,6 +12,7 @@ message(STATUS "BGSLIBRARY WITH PYTHON SUPPORT: ${BGS_PYTHON_SUPPORT}")
 
 if(UNIX)
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++0x")
+	set(CMAKE_MACOSX_RPATH 1)
 endif(UNIX)
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99")
diff --git a/gui_qt/CMakeLists.txt b/gui_qt/CMakeLists.txt
index 83c8920..c221484 100644
--- a/gui_qt/CMakeLists.txt
+++ b/gui_qt/CMakeLists.txt
@@ -2,6 +2,20 @@ cmake_minimum_required(VERSION 2.8.11)
 
 project(bgslibrary_gui)
 
+if(UNIX)
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++0x")
+	set(CMAKE_MACOSX_RPATH 1)
+
+	# add some standard warnings
+	ADD_DEFINITIONS(-Wno-variadic-macros -Wno-long-long -Wall -Wextra -Winit-self -Woverloaded-virtual -Wsign-promo -Wno-unused-parameter -pedantic -Woverloaded-virtual -Wno-unknown-pragmas)
+
+	# -ansi does not compile with sjn module
+	#ADD_DEFINITIONS(-ansi)
+
+	# if you like to have warinings about conversions, e.g. double->int or double->float etc., or float compare
+	#ADD_DEFINITIONS(-Wconversion -Wfloat-equal)
+endif(UNIX)
+
 # Find includes in corresponding build directories
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
diff --git a/wrapper_python/utils/conversion.cpp b/wrapper_python/utils/conversion.cpp
index 7ca21dd..f979d35 100644
--- a/wrapper_python/utils/conversion.cpp
+++ b/wrapper_python/utils/conversion.cpp
@@ -79,8 +79,7 @@ static PyObject* failmsgp(const char *fmt, ...)
   return 0;
 }
 
-#define OPENCV_3 0
-#if OPENCV_3
+#if CV_MAJOR_VERSION == 3
 class NumpyAllocator : public MatAllocator
 {
 public:
@@ -100,13 +99,13 @@ class NumpyAllocator : public MatAllocator
         return u;
     }
 
-    UMatData* allocate(int dims0, const int* sizes, int type, void* data, size_t* step, int flags) const
+    UMatData* allocate(int dims0, const int* sizes, int type, void* data, size_t* step, int flags, UMatUsageFlags usageFlags=USAGE_DEFAULT) const
     {
         if( data != 0 )
         {
             CV_Error(Error::StsAssert, "The data should normally be NULL!");
             // probably this is safe to do in such extreme case
-            return stdAllocator->allocate(dims0, sizes, type, data, step, flags);
+            return stdAllocator->allocate(dims0, sizes, type, data, step, flags, usageFlags);
         }
         PyEnsureGIL gil;
 
@@ -129,9 +128,9 @@ class NumpyAllocator : public MatAllocator
         return allocate(o, dims0, sizes, type, step);
     }
 
-    bool allocate(UMatData* u, int accessFlags) const
+    bool allocate(UMatData* u, int accessFlags, UMatUsageFlags usageFlags=USAGE_DEFAULT) const
     {
-        return stdAllocator->allocate(u, accessFlags);
+        return stdAllocator->allocate(u, accessFlags, usageFlags);
     }
 
     void deallocate(UMatData* u) const
@@ -294,7 +293,7 @@ cv::Mat NDArrayConverter::toMat(const PyObject *o)
     
     if( m.data )
     {
-#if OPENCV_3
+#if CV_MAJOR_VERSION == 3
       m.addref();
       Py_INCREF(o);
 #else
@@ -317,7 +316,7 @@ cv::Mat NDArrayConverter::toMat(const PyObject *o)
 
 PyObject* NDArrayConverter::toNDArray(const cv::Mat& m)
 {
-#if OPENCV_3
+#if CV_MAJOR_VERSION == 3
   if( !m.data )
         Py_RETURN_NONE;
     Mat temp, *p = (Mat*)&m;
diff --git a/wrapper_python/utils/conversion.h b/wrapper_python/utils/conversion.h
index 8ce616d..f9e5780 100644
--- a/wrapper_python/utils/conversion.h
+++ b/wrapper_python/utils/conversion.h
@@ -21,7 +21,7 @@ along with BGSLibrary.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <Python.h>
 #include <opencv2/opencv.hpp>
-#include <opencv2/core/core.hpp>
+#include <opencv2/core.hpp>
 #include <numpy/ndarrayobject.h>
 
 static PyObject* opencv_error = 0;