$ apt-get source xserver-xorg-core
Reading package lists... Done
Building dependency tree
Reading state information... Done
Picking 'xorg-server' as source package instead of 'xserver-xorg-core'
NOTICE: 'xorg-server' packaging is maintained in the 'Git' version control system at:
Skipping already downloaded file 'xorg-server_1.17.3.orig.tar.gz'
Skipping already downloaded file 'xorg-server_1.17.3-2.diff.gz'
Need to get 4,783 B of source archives.
Fetched 4,783 B in 0s (10.9 kB/s)
dpkg-source: info: extracting xorg-server in xorg-server-1.17.3
dpkg-source: info: unpacking xorg-server_1.17.3.orig.tar.gz
dpkg-source: info: applying xorg-server_1.17.3-2.diff.gz
dpkg-source: info: upstream files that have been modified:
xorg-server-1.17.3/.dir-locals.el
xorg-server-1.17.3/config/dbus-api
xorg-server-1.17.3/damageext/damageext.h
xorg-server-1.17.3/doc/c-extensions
xorg-server-1.17.3/dri3/dri3_event.c
xorg-server-1.17.3/dri3/dri3int.h
xorg-server-1.17.3/fix-miregion
xorg-server-1.17.3/fix-miregion-private
xorg-server-1.17.3/fix-patch-whitespace
xorg-server-1.17.3/fix-region
xorg-server-1.17.3/hw/kdrive/Xkdrive.man
xorg-server-1.17.3/hw/kdrive/fbdev/Xfbdev.man
xorg-server-1.17.3/hw/xfree86/os-support/shared/platform_noop.c
xorg-server-1.17.3/hw/xfree86/xorg-wrapper.c
xorg-server-1.17.3/hw/xquartz/GL/glcontextmodes.c
xorg-server-1.17.3/hw/xquartz/GL/glcontextmodes.h
xorg-server-1.17.3/hw/xwin/winclipboard/internal.h
xorg-server-1.17.3/xkb/XKM_file_format.txt