libqt4-private-dev 4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu4 (arm64 binary) in ubuntu vivid

 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 4 applications like Qt Creator QML Designer plugin.
 .
 Use at your own risk.