Hi, I have been trying to get filesystem::file_size() on boost_1_46_1 to work but am getting the following error: $ ./tut1 tut1.cpp boost::filesystem::file_size: Not owner: "tut1.cpp" Note: To avoid core file I modified tut1.cpp so that it catches exceptions. The permissions and ownership of tut1.cpp seem fine: -rw-r--r-- 1 redtaza staff 760 2011-05-07 10:40 tut1.cpp $ uname -a SunOS lunar 5.11 snv_151a i86pc i386 i86pc Solaris $ CC -V CC: Sun C++ 5.11 SunOS_i386 2010/08/13 usage: CC [ options ] files. Use 'CC -flags' for details $ CC -g -library=stlport4 -I/usr/local/boost_1_46_1/include tut1.cpp -o tut1 /usr/local/boost_1_46_1/lib/libboost_system.a /usr/local/boost_1_46_1/lib/libboost_filesystem.a Boost was built with the toolset sun and no other options. Also if I compile and run the following code (which I believe is similar to the code that file_size()) I get expected results: #include <iostream> #include #include #include #include <cstdio> int main(int argc, char* argv[]) { if (argc < 2) { std::cout << "Usage: tut1 path\n"; return 1; } struct stat path_stat; if(::stat(argv[1], &path_stat)!= 0) { std::perror("stat() error: "); return -1; } if(!S_ISREG(path_stat.st_mode)) { std::cerr << argv[1] << " is not a regular file\n"; return -1; } std::cout << path_stat.st_size << '\n'; return 0; } $ CC -g -library=stlport4 -I/usr/local/boost_1_46_1/include getFilesize.cpp -o getFilesize /usr/local/boost_1_46_1/lib/libboost_system.a /usr/local/boost_1_46_1/lib/libboost_filesystem.a $ ./getFilesize tut1.cpp 760 Thanks