5 POSIX specification: @url{http://www.opengroup.org/susv3xsh/strstr.html}
9 Portability problems fixed by Gnulib:
13 Portability problems not fixed by Gnulib:
16 This function cannot work correctly on character strings in most multibyte
17 locales. Gnulib provides an alternative function @code{mbsstr} that works
18 on character strings in all locales.