                  "/etc/X11/sessions/",
                  DMCONFDIR "/Sessions/",
                  DATADIR "/gdm/BuiltInSessions/",
-@@ -351,6 +352,10 @@ get_system_session_dirs (GdmSession *self)
-                 NULL
+                 DATADIR "/xsessions/",
          };
  
 +        if (getenv("GDM_SESSIONS_DIR") != NULL) {

         static const char *wayland_search_dir = DATADIR "/wayland-sessions/";
 
         search_array = g_array_new (TRUE, TRUE, sizeof (char *));

--- a/daemon/gdm-launch-environment.c
+++ b/daemon/gdm-launch-environment.c
@@ -126,7 +126,7 @@
                 "LC_COLLATE", "LC_MONETARY", "LC_MESSAGES", "LC_PAPER",
                 "LC_NAME", "LC_ADDRESS", "LC_TELEPHONE", "LC_MEASUREMENT",
                 "LC_IDENTIFICATION", "LC_ALL", "WINDOWPATH", "XCURSOR_PATH",
-                "XDG_CONFIG_DIRS", NULL
+                "XDG_CONFIG_DIRS", "GDM_SESSIONS_DIR", NULL
         };
         char *system_data_dirs;
         int i;
--- a/daemon/gdm-session.c
+++ b/daemon/gdm-session.c
@@ -345,12 +345,17 @@
         char **search_dirs;
 
         static const char *x_search_dirs[] = {
