option -- unrecognized
Usage: /usr/bin/gvmap <options> graphfile
   where graphfile must contain node positions, and widths and heights for each node. No overlap between nodes should be present. Acceptable options are:
    -a k - average number of artificial points added along the bounding box of the labels. If < 0, a suitable value is selected automatically. (-1)
    -b v - polygon line width, with v < 0 for no line. (0)
    -c k - polygon color scheme (1)
       0 : no polygons
       1 : pastel (default)
       2 : blue to yellow
       3 : white to red
       4 : light grey to red
       5 : primary colors
       6 : sequential single hue red
       7 : Adam color scheme
       8 : Adam blend
       9 : sequential single hue lighter red
      10 : light grey
    -c_opacity=xx - 2-character hex string for opacity of polygons
    -C k - generate at most k clusters. (0)
    -d s - seed used to calculate Fiedler vector for optimal coloring
    -D   - use top-level cluster subgraphs to specify clustering
    -e   - show edges
    -h k - number of artificial points added to maintain bridge between endpoints (0)
    -highlight=k - only draw cluster k
    -k   - increase randomness of boundary
    -m v - bounding box margin. If 0, auto-assigned (0)
    -o <file> - put output in <file> (stdout)
    -O   - do NOT do color assignment optimization that maximizes color difference between neighboring countries
    -r k - number of random points k used to define sea and lake boundaries. If 0, auto assigned. (0)
    -s v - depth of the sea and lake shores in points. If < 0, auto assigned. (0)
    -t n - improve contiguity up to n times. (0)
    -v   - verbose
    -z c - polygon line color (black)