Method to clean up MXE directory?

[Rik]

6/27/16

I'm getting the following errors when running the MXE version of Octave

warning: function
C:\Octave\Octave-4.1.0+\lib\octave\4.1.0+\oct\i686-w64-mingw32
\__magick_read__.oct shadows a built-in function
error: Invalid call to colormap.  Correct usage is:

 -- CMAP = colormap ()
 -- CMAP = colormap (MAP)
 -- CMAP = colormap ("default" )
 -- CMAP = colormap (MAP_NAME)
 -- CMAP = colormap (HAX, ...)
 -- colormap MAP_NAME
error: execution exception in
C:\Octave\Octave-4.1.0+\share\octave\4.1.0+\m\depr
ecated\PKG_ADD
error: Invalid call to colormap.  Correct usage is:

 -- CMAP = colormap ()
 -- CMAP = colormap (MAP)
 -- CMAP = colormap ("default" )
 -- CMAP = colormap (MAP_NAME)
 -- CMAP = colormap (HAX, ...)
 -- colormap MAP_NAME
error: execution exception in
C:\Octave\Octave-4.1.0+\share\octave\4.1.0+\m\imag
e\PKG_ADD

The first is because __magick_read__ has become a built-in function, the
second problem with PKG-ADD has also been fixed.  The problem is that these
files are no longer part of Octave, but are leftover in the MXE build
directory.  I could do 'make clean', but then it will take about 6 hours to
rebuild everything including the Qt libraries, gcc, etc.

Does anyone know how to clear the files associated with a specific target? 
Or do you just have to go in to the directories underneath the MXE build
directory and start removing files?

--Rik