x11proto-xinerama-dev 1.2.1-2 (i386 binary) in ubuntu bionic

 This package provides development headers describing the wire protocol
 for the XINERAMA extension, used to use and manage a multiple-screen
 display.
 The terms 'Xinerama' and 'PanoramiX' are generally interchangeable;
 this package used to be named x11proto-panoramix-dev.
 .
 More information about X.Org can be found at:
 <URL:http://www.X.org>
 .
 This package is built from the X.org xineramaproto proto module.