+@item
+On platforms where @code{off_t} is a 32-bit type, @code{mkstemp} may not work
+correctly to create files larger than 2 GB. (Cf. @code{AC_SYS_LARGEFILE}.)
+@item
+On some older platforms, @code{mkstemp} can create a world or group
+writable or readable file, if you haven't set the process umask to
+077. This is a security risk.