Package: libx11-6 Priority: important Version: 1.4.4-1 Source: libX11 Architecture: __ARCH__ Maintainer: Paul A. Whittaker Section: Libraries/X11 Destination: usr Depends: libxcb1, libc6 (>= 2.7-1) Description: X11 client library (Xlib) You need this package in order to run any kind of X11 application (including an X11 server). However, if you're planning on displaying the application locally, you'll need an X11 server also.