qtbase5-dev-dbgsym 5.5.1+dfsg-16ubuntu7 (i386 binary) in ubuntu xenial

 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 header development files used for building Qt 5
 applications.
 .
 If you are interested in packaging Qt 5 stuff please take a look at
 http://pkg-kde.alioth.debian.org/packagingqtbasedstuff.html