Comment 7 for bug 1284417

Tim -
gs has a build depend on gnome-session but not an install depend so it's not installed when users install gs in a Ubuntu 14.04 install
(granted those wanting to use gs would be better off using Ubuntu-Gnome but still..

Ex. on new 14.04 release install -
Commit Log for Fri May 2 11:06:41 2014

Installed the following packages:
gdm (3.10.0.1-0ubuntu3)
gir1.2-accountsservice-1.0 (0.6.35-0ubuntu7)
gir1.2-caribou-1.0 (0.4.13-0ubuntu1)
gir1.2-clutter-1.0 (1.16.4-0ubuntu2)
gir1.2-cogl-1.0 (1.16.2-1)
gir1.2-coglpango-1.0 (1.16.2-1)
gir1.2-gck-1 (3.10.1-1)
gir1.2-gcr-3 (3.10.1-1)
gir1.2-gdesktopenums-3.0 (3.10.1-0ubuntu1)
gir1.2-gdm-1.0 (3.10.0.1-0ubuntu3)
gir1.2-gkbd-3.0 (3.6.0-0ubuntu2)
gir1.2-gnomedesktop-3.0 (3.8.4-0ubuntu3)
gir1.2-json-1.0 (0.16.2-1ubuntu1)
gir1.2-mutter-3.0 (3.10.4-0ubuntu2)
gir1.2-nmgtk-1.0 (0.9.8.8-0ubuntu4)
gir1.2-polkit-1.0 (0.105-4ubuntu2)
gir1.2-telepathyglib-0.12 (0.22.1-1ubuntu2)
gir1.2-telepathylogger-0.2 (0.8.0-3)
gir1.2-upowerglib-1.0 (0.9.23-2ubuntu1)
gir1.2-xkl-1.0 (5.4-0ubuntu1)
gjs (1.39.91-0ubuntu1)
gnome-control-center (1:3.6.3-0ubuntu56)
gnome-control-center-data (1:3.6.3-0ubuntu56)
gnome-icon-theme-full (3.10.0-0ubuntu2)
gnome-settings-daemon (3.8.6.1-0ubuntu11)
gnome-shell (3.10.4-0ubuntu5)
gnome-shell-common (3.10.4-0ubuntu5)
gnome-themes-standard (3.10.0-1ubuntu2)
gnome-themes-standard-data (3.10.0-1ubuntu2)
gtk2-engines-pixbuf (2.24.23-0ubuntu1)
libcaribou-common (0.4.13-0ubuntu1)
libcaribou0 (0.4.13-0ubuntu1)
libgdm1 (3.10.0.1-0ubuntu3)
libgjs0e (1.39.91-0ubuntu1)
libgoa-backend-1.0-1 (3.10.3-0ubuntu1)
libmozjs-24-0 (24.2.0-1)
libmutter0c (3.10.4-0ubuntu2)
libxcb-xf86dri0 (1.10-2ubuntu1)
mutter-common (3.10.4-0ubuntu2)
xserver-xephyr (2:1.15.1-0ubuntu2)