Hi, I can't seem to get file_descriptor* family of classes to work. I've reduced my code to the following (actually I want to write to sockets): #include #include namespace io = boost::iostreams; int main(int argc, char *argv[]) { typedef io::streamio::file_descriptor_sink ofdstream; ofdstream outstream(1); } Here's what happens when I try to compile (under Mac OS X): erato:bioinf jergosh$ g++ -I/usr/local/boost_1_39_0 -o fdboost fdboost.cpp Undefined symbols: "boost::iostreams::file_descriptor::file_descriptor(int, bool)", referenced from: boost::iostreams::file_descriptor_sink::file_descriptor_sink(int, bool)in ccuxOs9P.o "boost::iostreams::file_descriptor::close()", referenced from: void boost ::iostreams ::detail ::close_impl < boost ::iostreams ::closable_tag

::close < boost ::iostreams ::file_descriptor_sink>(boost::iostreams::file_descriptor_sink&, std::_Ios_Openmode)in ccuxOs9P.o "boost::iostreams::file_descriptor::write(char const*, int)", referenced from: int boost ::iostreams ::detail ::write_device_impl < boost ::iostreams ::output

::write < boost ::iostreams ::file_descriptor_sink>(boost::iostreams::file_descriptor_sink&, boost ::iostreams ::char_type_ofboost::iostreams::file_descriptor_sink::type const*, int)in ccuxOs9P.o "boost::iostreams::file_descriptor::seek(long long, std::_Ios_Seekdir)", referenced from: std::fpos<__mbstate_t> boost ::iostreams ::detail ::seek_device_impl < boost ::iostreams ::any_tag

::seek < boost ::iostreams ::file_descriptor_sink>(boost::iostreams::file_descriptor_sink&, long long, std::_Ios_Seekdir, std::_Ios_Openmode)in ccuxOs9P.o ld: symbol(s) not found collect2: ld returned 1 exit status What am I missing here? TIA, Greg -- Greg Slodkowicz Building 208, Room 012a Center for Biological Sequence Analysis Department of Systems Biology Technical University of Denmark