diff --git a/PoissonRecon.pro b/PoissonRecon.pro
new file mode 100755
index 00000000..33f5bf60
--- /dev/null
+++ b/PoissonRecon.pro
@@ -0,0 +1,36 @@
+QT       -= core gui
+INCLUDEPATH -= .
+
+### begin mac specific part #################
+# On OSX xcode clang does NOT support OpenMP. 
+# Use these two lines if you installed an alternative clang with macport 
+# (something like 'sudo port install clang-3.9') 
+# Note that on osx  qtcreator could have just a vanilla path environment, 
+# so, if using the below option fails to find the port-installed compiler you should 
+# add the port bin folder to the qtcreator environment path 
+# (adding something like  PATH="/opt/local/bin:/opt/local/sbin:$PATH"   )
+macx:QMAKE_CXX = clang++-mp-3.9
+macx:QMAKE_LFLAGS += -L/opt/local/lib/libomp -lomp
+
+# Use this if you want to use the standard clang distributed with xcode
+# macx:QMAKE_CXXFLAGS-= -fopenmp
+
+# Mac specific Config required to avoid to make application bundles
+CONFIG -= app_bundle
+### end of mac specific part #################
+
+QMAKE_CXXFLAGS+=-fopenmp -Wsign-compare -O3 -DRELEASE -funroll-loops -ffast-math
+
+CONFIG += console warn_off
+TEMPLATE = app
+
+SOURCES +=  Src/PoissonRecon.cpp \
+            Src/MarchingCubes.cpp \
+            Src/PlyFile.cpp \
+            Src/CmdLineParser.cpp \
+            Src/Factor.cpp \
+            Src/Geometry.cpp
+
+
+TARGET=PoissonRecon
+
diff --git a/Src/MultiGridOctreeData.h b/Src/MultiGridOctreeData.h
index 595ebdc7..b5aa8082 100644
--- a/Src/MultiGridOctreeData.h
+++ b/Src/MultiGridOctreeData.h
@@ -54,7 +54,9 @@ DAMAGE.
 #define MAX_MEMORY_GB 0
 
 #include <unordered_map>
+#ifdef _OPENMP
 #include <omp.h>
+#endif // _OPENMP
 #include "BSplineData.h"
 #include "PointStream.h"
 #include "Geometry.h"
@@ -336,7 +338,7 @@ struct DenseNodeData
 	Data& operator[]( const OctNode< TreeNodeData >* node ) { return _data[ node->nodeData.nodeIndex ]; }
 	Data* operator()( const OctNode< TreeNodeData >* node ) { return ( node==NULL || node->nodeData.nodeIndex>=(int)_sz ) ? NULL : &_data[ node->nodeData.nodeIndex ]; }
 	const Data* operator()( const OctNode< TreeNodeData >* node ) const { return ( node==NULL || node->nodeData.nodeIndex>=(int)_sz ) ? NULL : &_data[ node->nodeData.nodeIndex ]; }
-	int index( const OctNode< TreeNodeData >* node ) const { return ( !node || node->nodeData.nodeIndex<0 || node->nodeData.nodeIndex>=(int)_data.size() ) ? -1 : node->nodeData.nodeIndex; }
+	int index( const OctNode< TreeNodeData >* node ) const { return ( !node || node->nodeData.nodeIndex<0 || node->nodeData.nodeIndex>=(int)this->_data.size() ) ? -1 : node->nodeData.nodeIndex; }
 protected:
 	size_t _sz;
 	void _resize( size_t sz ){ DeletePointer( _data ) ; if( sz ) _data = NewPointer< Data >( sz ) ; else _data = NullPointer( Data ) ; _sz = sz; }