+@item
+On some hosts that predate C++11, when using C++ one must define
+@code{__STDC_CONSTANT_MACROS} to make visible the definitions of
+constant macros such as @code{INTMAX_C}, and one must define
+@code{__STDC_LIMIT_MACROS} to make visible the definitions of limit
+macros such as @code{INTMAX_MAX}.