viking -V (return code: 1)
Parsing command line options failed: Cannot open display:
Run "viking --help" to see the list of recognized options.
viking --help (return code: 0)
Usage:
viking [OPTION?] files+
Help Options:
-h, --help Show help options
--help-all Show all help options
--help-gtk Show GTK+ Options
Application Options:
-d, --debug Enable debug output
-V, --verbose Enable verbose output
-v, --version Show version
--latitude Latitude in decimal degrees
--longitude Longitude in decimal degrees
-z, --zoom Zoom Level (OSM). Value can be 0 - 22
-m, --map Add a map layer by id value. Use 0 for the default map.
--display=DISPLAY X display to use