qtdeclarative5-private-dev 5.15.4+dfsg-1 (s390x binary) in ubuntu kinetic

 Qt is a cross-platform C++ application framework. Qt's primary feature
 is its rich set of widgets that provide standard GUI functionality.
 .
 This package contains the private header development files for building some
 Qt 5 applications using Qt 5 declarative private headers.
 .
 Use at your own risk.