ORFEO Toolbox (OTB) is an open source library of image processing algorithms. OTB is based on the medical image processing library ITK and offers particular functionalities for remote sensing image processing in general and for high spatial resolution images in particular. Targeted algorithms for high resolution optical images (Pleiades, SPOT, QuickBird, WorldView, Landsat, Ikonos), hyperspectral sensors (Hyperion) or SAR (TerraSarX, ERS, Palsar) are available. This slackbuild is based on a legacy version of OTB and includes by default the satellite image viewer Monteverdi, with access to OTB processing, in a single build. OTB-legacy will be built with support for the following packages if they are available at compile time: numpy3, openmpi, glfw3. Warning: the build fails if Shark is not built against the optional dependency cblas that gives the support to ATLAS.