grass-dev binary package in Ubuntu Focal riscv64

 Commonly referred to as GRASS, this is a Geographic Information
 System (GIS) used for geospatial data management and analysis,
 image processing, graphics/map production, spatial modeling, and
 visualization. GRASS is currently used in academic and commercial
 settings around the world, as well as by many government agencies
 and environmental consulting companies.
 .
 This package contains the header files for developing with GRASS.
 Install this package if you wish to develop software that manipulates
 GRASS data sets or install addons using the g.extension module.

Source package