5 POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/unlink.html}
9 Portability problems fixed by Gnulib:
13 Portability problems not fixed by Gnulib:
16 Removing an open file is non-portable: On Unix this allows the programs that
17 have the file already open to continue working with it; the file's storage
18 is only freed when the no process has the file open any more. On Windows,
19 the attempt to remove an open file fails.