Binary package “libxsettings-dev” in ubuntu cosmic

Xsettings protocol (development files)

 Provides a mechanism to allow the configuration of settings such as double
 click timeout, drag-and-drop threshold, and default foreground and
 background colors for all applications running within a desktop.
 .
 This package contains the development files for building applications
 using libxsettings.
 .
 Used by the GPE Palmtop Environment.