- this patch was made against gv-3.6.2 sources coming with debian.
  Not tested with other versions.

- how to apply:
    - cd /path/to/gv-source
    - patch -p1 </path/to/the/patch
    - build gv; with the version coming with debian, it's as simple
      as: 
      ./configure; make

- how to use:
  - press z to append the current coordinate to a file named
    "gv.savepos" in the current directory

- feedbacks: please send them to <hanthethanh gmail com>