Hi, I've been exploring Paul D's midi++ library. I'm trying to compile a test driver roughly equivalent to the miditrace which is provided. Compilation goes fine, but linking is a problem. I get: midi++/libmidipp.a(fd_midiport.o)(.text+0x557): In function `MIDI::FD_MidiPort::list_devices()': /home/avan/src/ardour-cvs/libs/midi++/fd_midiport.cc:95: undefined reference to `PathScanner::operator()(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool, bool, long)' So FD_MidiPort::list_devices () has { PathScanner scanner; return scanner (*midi_dirpath, *midi_filename_pattern, false, true); } The first two arguments are strings. The PathScanner is part of libpbd and has the overloaded operator: vector<string *> *operator() (const string &dirpath, const string &regexp, bool match_fullpath = true, bool return_fullpath = true, long limit = -1); which AFAICT should match the call in list_devices(). I'm using gcc (GCC) 3.2.1 20021207 (Gentoo Linux 3.2.1-20021207) and I suspect this may be the problem. Any help would be appreciated. --ant