Weird debug output?

[Sebastien Loisel]

I added this:

void init_builtins(void)
{
  install_builtin_function(Finternal_my_plot,"internal_my_plot",
                           "Internal function -- do not call", false);
}

to my code, and it does work, but on the console I see this weird output:

sh-2.04$ ./octave-workshop
GNU Octave, version 2.9.4 (i686-pc-mingw32).
(...)
Report bugs to <address@hidden
> (but first, please read
http://www.octave.org/bugs.html to learn how to write a helpful report).

__nargin__
__octfiledir__
__nargin__
__octfiledir__

I grepped through all my files and all of octave-2.1.72/*/*.cc and .h and haven't found __octfiledir__. What's going on?

Cheers,

Sébastien Loisel