+ *Warning:* Modules are _not_ loaded with the `RTLD_GLOBAL' flag.
+The practical upshot is that individual modules do not have access to
+each other's C symbols. One module cannot make a C function call to a
+function defined in another module, nor can it read or set a C variable
+in another module. All interaction between modules must, therefore,
+take place at the Lisp level. This is by design. Other projects have
+attempted to use `RTLD_GLOBAL', only to find that spurious symbol name
+clashes were the result. Helper functions often have simple names,
+increasing the probability of such a clash. If you really need to
+share symbols between modules, create a shared library containing those
+symbols, and link your modules with that library. Otherwise,
+interactions between modules must take place via Lisp function calls
+and Lisp variables accesses.
+