-@samp{O_NOCTTY}, @samp{O_DSYNC}, @samp{O_NONBLOCK}, @samp{O_RSYNC},
-@samp{O_SYNC}, @samp{O_DIRECTORY}, @samp{O_NOFOLLOW}, and
-@samp{O_TTY_INIT} are not defined on some platforms.
+@samp{O_CLOEXEC}, @samp{O_DIRECTORY}, @samp{O_DSYNC}, @samp{O_NOCTTY},
+@samp{O_NOFOLLOW}, @samp{O_NONBLOCK}, @samp{O_RSYNC}, @samp{O_SYNC},
+and @samp{O_TTY_INIT} are not defined on some platforms. Gnulib defines
+these macros to 0.
+
+@item
+@samp{O_EXEC} and @samp{O_SEARCH} are not defined on some platforms.
+Gnulib defines these macros to @samp{O_RDONLY}, which is typically 0.