libhx-dev 3.25-2build2 (riscv64 binary) in ubuntu lunar

 a C library (with some C++ bindings available) that provides data
 structures and functions commonly needed, such as maps, deques, linked lists,
 string formatting and autoresizing, option and config file parsing, type
 checking casts and more.
 .
 This package contains the development libraries, header files needed by
 programs that want to compile with libHX.