5 POSIX specification: @url{http://www.opengroup.org/susv3xsh/calloc.html}
9 Portability problems fixed by Gnulib:
13 Portability problems not fixed by Gnulib:
17 Extension: Gnulib provides a module @samp{calloc} that substitutes a
18 @code{calloc} implementation that behaves more like the glibc implementation.