interface_build {
    {r.flowmd} 0
    {Construction of slope lines (flowlines), flowpath lengths and flowline densities from DEM using multiple modified direction algorithm.}
    {entry elevin {Input elevation raster map:} 0 raster}
    {entry aspin {Input aspect raster map (optional):} 0 raster}
    {entry barrierin {Input binary barrier raster map (optional):} 0 raster}
    {entry skip {Set number of cells between flowlines in flowline output map (optional, def.=max):} 0 ""}
    {entry bound {Set maximum number of segments of each flowline (optional):} 0 ""}
    {entry flout {Output vector flowline map:} 0 vector}
    {entry lgout {Flowpath length map (optional):} 0 raster}
    {entry dsout {Output flowline density map (optional):} 0 raster}
    {checkbox -d {Generate flowlines downhill (default: uphill).} "" -d}

}