liboctave-dev 5.1.0-4build1 (armhf binary) in ubuntu focal

 Octave is a (mostly Matlab (R) compatible) high-level language, primarily
 intended for numerical computations. It provides a convenient command-line
 interface for solving linear and nonlinear problems numerically.
 .
 This package provides the header files and the mkoctfile script used for
 extending Octave via compiled code.