Dear Sir/ Madam, A very good day to you. I installed boost 1.50 installer (32-bit) which downloaded from http://www.boostpro.com/download/ and did the appropriate settings (including CGAL) in Microsoft Visual Studio 2010. I would like to run the following sample code: #include <iostream> #include <CGAL\Exact_predicates_inexact_constructions_kernel.h> #include <CGAL\convex_hull_2.h> typedef CGAL::Exact_predicates_inexact_constructions_kernel K; typedef K::Point_2 Point_2; int main() { Point_2 points[5] = { Point_2(0, 0), Point_2(10, 0), Point_2(10, 10), Point_2(6, 5), Point_2(4, 1) }; Point_2 result[5]; Point_2 *ptr = CGAL::convex_hull_2( points, points+5, result ); std::cout << ptr - result << " points on the convex hull" << std::endl; return 0; } There are no errors during compilation but there are errors during the build as shown below: 1>------ Build started: Project: Cgal_Hello, Configuration: Debug Win32 ------ 1>libboost_system-vc100-mt-gd-1_50.lib(error_code.obj) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char>

::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@@Z) already defined in msvcprtd.lib(MSVCP90D.dll)

1>libboost_system-vc100-mt-gd-1_50.lib(error_code.obj) : error LNK2019: unresolved external symbol "__declspec(dllimport) void __cdecl std::_Xout_of_range(char const *)" (__imp_?_Xout_of_range@std@@YAXPBD@Z) referenced in function "public: void __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::_Xran(void)const " (?_Xran@?$basic_string@DU ?$char_traits@D@std@@V?$allocator@D@2@@std@@QBEXXZ) 1>D:\Cgal_Hello\Debug\Cgal_Hello.exe : fatal error LNK1120: 5 unresolved externals Can anyone please help me with this issues? desperately need help... In addition, if I have installed the installer, do I still have to use bjam.exe to build the libraries? Hope to hear from you soon. Thank you very much. -- Best Regards, Saw