[Dev-C++] appending to a file

[Alan T. <ala...@3n...>]

     I am trying to append to a file.  However, the compiler gives me
the following error:
                                           'ios_base'  undeclared
                                          (first use this function)

 The code is below.  Any idea what I am doing wrong?          Thanks, =
Alan

 #include <fstream>

 int main()
 {
  fstream append_file;

  append_file.open("test_append.txt", ios_base::app);
  append_file << "This is a line of text." << endl;
  append_file.close()

  return 0;
 }