Hello ¡¡¡ Probed with boost 1.38 and 1.40 on linux ubuntu karmic Example: check64.cpp --------------- #include "check64.hpp" int main() { point2<int> png_size1(3,4); point2<int> png_size2; wxMessageBox( wxT("Reading png dimensions prueba.png "), wxT("Hello") ); // ok, compile into 32bits and 64bits png_size2=png_size1; // ok, compile into 32bits and 64bits png_read_dimensions( "prueba.png" ); //ERROR, THIS ONLY COMPILE WITH 32bits png_size1 = png_read_dimensions( "prueba.png" ); return 0; } ---------------------------------------- The error when try to compile with 64bits is: error: no match for ‘operator=’ in ‘png_size1 = boost::gil::png_read_dimensions(const char*)()’ Anybody knows what is happening ? The head file, check64.hpp is -------------------------- check64.hpp ------------- #ifndef CHECK64_HPP_INCLUDED #define CHECK64_HPP_INCLUDED #include <boost/gil/gil_all.hpp> #include <boost/gil/extension/io/png_io.hpp> #include <wx/wx.h> using namespace boost; using namespace boost::gil; using namespace std; #endif // CHECK64_HPP_INCLUDED --------------------------end of code -------------- Thank's a lot of