5 POSIX specification: @url{http://www.opengroup.org/susv3xsh/glob.html}
9 Portability problems fixed by Gnulib:
12 This function is missing on some platforms:
15 This function may list symbolic links to nonexistent files among the results,
19 Portability problems not fixed by Gnulib:
22 Some platforms may store additional flags in the @code{gl_flags} field.