interface_build {
    {i.pca} 0
    {Principal components analysis (pca) program for image processing.}
    {entry input {Input raster maps (name[,name,...]):} 0 +raster}
    {entry output {Output raster map:} 0 raster}
    {entry rescale {Rescaling range output (min,max) [1,255]:} 0 ""}
}