scheme_make_enunvbox

[Robert John Andersen <anderman@anderware.com>]

The documentation  for units library functions in inside mzscheme makes
reference to:

  Scheme_Object *scheme_make_enunvbox(Scheme_Object *vbox)

but when I load the extension I get a no symbol error.  I also searched the
source code and coulnd't find it either.  Is it supposed to there or is the
documentation wrong?

Thanks.
RJA