interface_build {
    {s.windavg} 0
    {Average an attribute of a site_list over each cell in the region}
    {checkbox -q  {Be quiet:} "" -q}
    {checkbox -z  {Suppress zero averages:} "" -z}
    {checkbox -p  {Output in g.gnuplot format:} "" -p}
    {entry input  {Name of input sites map:} 0 sites}
    {entry attr   {Attribute to use (default: cat):} 0 ""}
    {entry index  {Index of attribute:} 0 ""}
    {entry output {Name of new sites file:} 0 sites}
}