Dear all, I believe, I have set the environment right for the boost libraries. I had done a program a while ago using shared pointers. And after mentioning the includes in the additional includes directories, it compiled. However, no matter what I am trying to do here, the compiler does not find matrix.hpp and vector.hpp in the attached project. I am using Boost version 1.44.0. I have checked the paths and the files do exist there. But, I do not know why my compiler keeps complaining about them being not found. The errors I am getting are as under: Error 1 fatal error C1083: Cannot open include file: 'boost/numeric/ublas/matrix.hpp': No such file or directory c:\users\user\documents\visual studio 2008\projects\dbscanalgo\dbscanalgo\clusters.h 5 DBScanAlgo Error 2 fatal error C1083: Cannot open include file: 'boost/numeric/ublas/matrix.hpp': No such file or directory c:\users\user\documents\visual studio 2008\projects\dbscanalgo\dbscanalgo\dbscan.h 5 DBScanAlgo Error 3 fatal error C1083: Cannot open include file: 'boost/numeric/ublas/matrix.hpp': No such file or directory c:\users\user\documents\visual studio 2008\projects\dbscanalgo\dbscanalgo\dbscan.h 5 DBScanAlgo Now, I have configured my paths as under: $(BOOST_ROOT) is ,....C:\Program Files\boost\boost_1_44_0 Then in VS 2008 IDE on main menu, Tools | Options | Projects and Solutions | VC++ directories... I have added... For Include Files : $(BOOST_ROOT)Boost For library files : $(BOOST_ROOT)stage\lib; $(BOOST_ROOT)\libs; $(BOOST_ROOT)bin.V2 Also, after having done this, I go to the project properties, I go to C/C++ Node and on the RHS pane in the "Additional Include Directories" option add the path to "C:\Program Files\boost\boost_1_44_0\boost\numeric\ublas". Even then, I am not able to get it working. Just for your information, I am running VS 2008 professional edition on Windows 7 OS. Please let me know if there is anything wrong here. Thanks, Bhushan