mupdf 1.21.1+ds2-1 (riscv64 binary) in ubuntu lunar

 MuPDF is a lightweight PDF viewer and toolkit written in portable C.
 It also reads XPS, OpenXPS and ePub documents.
 .
 The renderer in MuPDF is tailored for high quality anti-aliased graphics.
 It renders text with metrics and spacing accurate to within fractions of a
 pixel for the highest fidelity in reproducing the look of a printed page
 on screen.