Hi, I'm trying to compile this example http://www.boost.org/libs/graph/example/johnson-eg.cpp. I have the following error from VC++ 6 SP2: --------------------Configuration: johnson-eg - Win32 Debug-------------------- Compiling... johnson-eg.cpp c:\arquivos de programas\microsoft visual studio\vc98\include\boost\graph\graph_concepts.hpp(479) : error C2664: 'const_constraints' : cannot convert parameter 1 from 'int [5][5]' to 'const int (&)[5][5]' Reason: cannot convert from 'int [5][5]' to 'const int [5][5]' There is no context in which this conversion is possible c:\arquivos de programas\microsoft visual studio\vc98\include\boost\graph\graph_concepts.hpp(477) : while compiling class-template member function 'void __thiscall boost::BasicMatrixConcept::constraints(void)' Error executing cl.exe. johnson-eg.exe - 1 error(s), 0 warning(s) Does anyone know what's wrong? Regards Marcio Paim