libxsettings-client-dev 0.17-10 (amd64 binary) in ubuntu bionic

 This package contains headers and other files required to compile
 software using the GPE scheduling library to use the Xsettings
 configuration setting propagation protocol. Controls setting of
 double click timeout, drag-and-drop threshold, and default foreground and
 background colors for all applications running within a desktop.
 .
 Used by the GPE Palmtop Environment.