This function does not support the @samp{ls} directive on some platforms:
OpenBSD 4.0, IRIX 6.5, Solaris 2.6, Haiku.
@item
+This function does not support precisions in the @samp{ls} directive correctly
+on some platforms:
+Solaris 10.
+@item
This function does not support format directives that access arguments in an
arbitrary order, such as @code{"%2$s"}, on some platforms:
NetBSD 3.0, mingw, BeOS.