Using mkoctfile of a freshly built Octave

Hi,

as part of a unit test, I would like to use mkoctfile from a fresh
built, ie after I ran

        make
the following
        make check
should use the newly compiled mkoctfile. Using just 'mkoctfile' in the
Makefile uses the command from an already installed Octave, so how do I
get the 'fresh' one?

Thanks
        Thomas