[cpp] data-io.o data-io.c++: In member function ‘void DataBinner::mmap_textfile()’: data-io.c++:579:15: warning: ignoring return value of ‘int fileno(FILE*)’, declared with attribute warn_unused_result data-io.c++: In member function ‘virtual int DataTexter::read_fileformat_versionnr()’: data-io.c++:484:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [cpp] data.o make: *** [.compile] Error 2