how to add my own dependencies to LAMMPS makefile

Hello LAMMPS users

I'm trying to add some new dependencies to the lammps makefile but it
doesn't work so I think I missed something.
For instance, I want to add VTK. So I added the following lines to the
corresponding makefile in MAKE directory

VTK = /opt/local/include/vtk-5.8/
VTK_INC = -DVTK
VTK_PATH = /opt/local/lib/vtk-5.8/
VTK_LIB = -lvtkHybrid \
    -lvtkVolumeRendering \
    -lvtkRendering \
    -lvtkIO \
    -lvtkGenericFiltering \
    -lvtkGraphics \
    -lvtkImaging \
    -lvtkFiltering \
    -lvtkCommon \
    -lvtkftgl \
    -lvtkfreetype \
    -lvtkDICOMParser \
    -lvtkexpat \
    -lvtktiff \
    -lvtkpng \
    -lvtkjpeg \
    -lvtkzlib \
    -lvtksys -lz

And then I added VTK_INC, VTK_PATH, VTK_LIB to the EXTRA_INC,
EXTRA_PATH, EXTRA_LIB

Then I tried to compile the code as usual:

make clean-all
make myMakefile

But it doesn't find included vtk headers:
./MyFile.h:16:10: fatal error: 'VTKHeader.h' file not found

It should probably be VTK_INC = -IVTK

Steve