5 POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/memchr.html}
9 Portability problems fixed by Gnulib:
12 This function is missing on some older platforms.
15 This function dereferences too much memory on some platforms:
16 glibc 2.10 on x86_64, IA-64, Alpha.
19 Portability problems not fixed by Gnulib: