libdbusmenu-jsonloader-dev 16.04.1+18.10.20180917-0ubuntu6 (s390x binary) in ubuntu focal

 libdbusmenu passes a menu structure across DBus so that a program can
 create a menu simply without worrying about how it is displayed on the
 other side of the bus.
 .
 This package contains files that are needed to build test suites in
 applications or libraries using dbusmenu.