+Portability problems fixed by either Gnulib module @code{memchr} or @code{memchr-obsolete}:
+@itemize
+@item
+This function dereferences too much memory on some platforms:
+glibc 2.10 on x86_64, IA-64; glibc 2.11 on Alpha.
+@end itemize
+
+Portability problems fixed by Gnulib module @code{memchr-obsolete}: