GRASS (Geographic Resources Analysis Support System) is a free Geographic Information System (GIS) used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization. GRASS is an official project of the Open Source Geospatial Foundation. GRASS requires proj, gdal, numpy and wxPython. The following optional dependencies may be enabled: blas lapack geos ffmpeg mysql postgresql sqlite The options you require must be specified by setting the variable ENABLE before running grass.SlackBuild, for example ENABLE="sqlite,ffmpeg" ./grass.SlackBuild If you need to make grass libraries available on the system echo /opt/grass/lib >> /etc/ld.so.conf && ldconfig