libtse3-dev binary package in Ubuntu Focal riscv64

 TSE3 is a portable open source MIDI sequencer engine written in C++.
 It provides programmers with rich and powerful sequencing
 capabilities. Although it does not provide a user interface, it
 provides a lot of assistance to a UI, attempting to provide as much
 functionality as possible in as generic a manner as possible.
 .
 This package provides the headers and static libraries that are
 needed to compile something that uses tse3. It is not required to run
 programs that are linked against tse3.

Source package