libtoon-dev binary package in Ubuntu Jammy riscv64

 TooN is a C++ numerics library which is designed to operate
 efficiently on large numbers of small matrices, and provides easy
 access to a number of algorithms including matrix decompositions and
 optimizations.
 .
 TooN is type generic and works well with a variety of numeric types
 including double, float and automatic differentiation types.
 .
 It is designed to integrate very will with the libCVD computer vision
 library and GVars3 configuration library.

Source package