Bug#845349: xoscope build-depends on obsolete package libgtkdatabox-0.9.2-0-dev

[peter green]

Package: xoscope
Version: 2.2-0.1
Tags: stretch, sid
Severity: serious

xoscope build-depends on libgtkdatabox-0.9.2-0-dev which is no longer built by 
source package libgtkdatabox