Build fails with boost1.40/boost1.42

[Neil Dantam]

Building against boost1.40 (Ubuntu Lucid) or boost1.42 (Debian Squeeze) fails with the following error:

  gui/Gui.cc: In member function ‘void peekabot::gui::Gui::load_stock_icons(const boost::filesystem::path&)’:
  gui/Gui.cc:690: error: ‘struct std::basic_string<char, std::char_traits<char>, std::allocator<char> >’ has no member named ‘string’

The relevant section of the code is:

#if BOOST_FILESYSTEM_VERSION == 2
            std::string leaf = it->path().filename();
#else
            std::string leaf = it->path().filename().string();
#endif

The offending line in Gui.cc is:

  std::string leaf = it->path().filename().string();

Changing to the following fixes the problem:

    std::string leaf = it->path().filename();

Maybe some additional configure check is needed to figure out whether the ".string()" is needed?