libgmt-dev 6.4.0+dfsg-1 (riscv64 binary) in ubuntu lunar

 These set of libraries allow manipulating geographic and Cartesian data sets
 (including filtering, trend fitting, gridding, projecting, etc.) and
 producing Encapsulated PostScript File (EPS) illustrations ranging from
 simple x-y plots via contour maps to artificially illuminated surfaces
 and 3-D perspective views.
 .
 This package contains the files used for development of programs that
 use the GMT libraries (headers).