[plt-scheme] glLogicOp implemented ?

I get an error:

reference to undefined identifier: gl-logic-op

gl-logicop does not work either.


however it appears to be in gl-prims.c :

static Scheme_Object *scm_LogicOp(void *p, int c, Scheme_Object **v)
{
        glLogicOp(arg_GLenum(0));
        return scheme_void;
}

...

        { "glLogicOp",                  scm_LogicOp,                    1, 1 },


???

Brian