ofoo(foo_t *f, int n);  /* Declare an external C function. */</span>
]]
</pre>
<p>
The contents of the string (the part in green above) must be a
sequence of
<a href="ext_ffi_semantics.html#clang">C&nbsp;declarations</a>,
separated by semicolons. The trailing semicolon for a single
declaration may be omitted.
</p>
<p>
Please note that external symbols are only <em>declared</em>, but they
are <em>not bound</em> to any specific address, yet. Binding is
achieved with C&nbsp;library namespaces (see below).
</p>