gnu: gdm: Update to 40.1.

* gnu/packages/patches/gdm-elogind-support.patch: New file.
* gnu/packages/patches/gdm-default-session.patch: Update it.
* gnu/local.mk (DIST_PATCH_DATA): Add the new patch.
* gnu/packages/gnome.scm (gdm): Update to 40.1.
[source]: Add the gdm-elogind-support support.
[build-system]: Switch to meson-build-system.
[arguments]<#:glib-or-gtk>: Set to true.
<#:configure-flags>: Convert to meson options. Add logind-provider,
systemsystemunitdir and systemduserunitdir options.
<#:phases>{pre-configure}: Remove the libelogind intoduction that is now
handled by the patch. Remove trailing #t.
[inputs]: Add eudev.

3 files changed, 344 insertions, 130 deletions

diff --git a/gnu/packages/gnome.scm b/gnu/packages/gnome.scm
index 0f4182aa0b..bb0e2aa6d3 100644
--- a/gnu/packages/gnome.scm
+++ b/gnu/packages/gnome.scm
@@ -8116,128 +8116,132 @@ library.")
 (define-public gdm
   (package
     (name "gdm")
-    (version "3.34.1")
+    (version "40.1")
     (source (origin
               (method url-fetch)
               (uri (string-append "mirror://gnome/sources/" name "/"
-                                  (version-major+minor version) "/"
+                                  (version-major version) "/"
                                   name "-" version ".tar.xz"))
               (sha256
                (base32
-                "1lyqvcwxhwxklbxn4xjswjzr6fhjix6h28mi9ypn34wdm9bzcpg8"))
-              (patches (search-patches "gdm-default-session.patch"))))
-    (build-system glib-or-gtk-build-system)
+                "1zbks7bwbys1pn7sk0aq0dbn09adx51amb441z4z4j28cvma3f5b"))
+              (patches
+               (search-patches
+                "gdm-default-session.patch"
+                "gdm-elogind-support.patch"))))
+    (build-system meson-build-system)
     (arguments
-     '(#:configure-flags
-       `("--without-plymouth"
-         "--disable-systemd-journal"
-
-         ;; Using --with-initial-vt=7 allows GDM to run alongside TTY 1,
-         ;; instead of having to replace it (i.e., stopping the mingetty
-         ;; service for TTY 1 before starting GDM).
-         "--with-initial-vt=7"
-
-         ;; Use '/etc/environment' for locale settings instead of the
-         ;; systemd-specific '/etc/locale.conf'.
-         "--with-lang-file=/etc/environment"
-
-         ,(string-append "--with-udevdir="
-                         (assoc-ref %outputs "out") "/lib/udev")
-
-         "--localstatedir=/var"
-         ,(string-append "--with-default-path="
-                         (string-join '("/run/setuid-programs"
-                                        "/run/current-system/profile/bin"
-                                        "/run/current-system/profile/sbin")
-                                      ":"))
-         ;; Put GDM in bindir so that glib-or-gtk-build-system wraps the
-         ;; XDG_DATA_DIRS so that it finds its schemas.
-         "--sbindir" ,(string-append (assoc-ref %outputs "out") "/bin"))
+     `(#:glib-or-gtk? #t
+       #:configure-flags
+       ,#~(list
+           "-Dplymouth=disabled"
+           "-Dsystemd-journal=false"
+
+           ;; Using --with-initial-vt=7 allows GDM to run alongside TTY 1,
+           ;; instead of having to replace it (i.e., stopping the mingetty
+           ;; service for TTY 1 before starting GDM).
+           "-Dinitial-vt=7"
+
+           ;; Use elogind instead of systemd.
+           "-Dlogind-provider=elogind"
+           "-Dsystemdsystemunitdir=no"
+           "-Dsystemduserunitdir=no"
+
+           ;; Use '/etc/environment' for locale settings instead of the
+           ;; systemd-specific '/etc/locale.conf'.
+           "-Dlang-file=/etc/environment"
+
+           (string-append "-Dudev-dir=" #$output "/lib/udev")
+
+           "--localstatedir=/var"
+           (string-append "-Ddefault-path="
+                          (string-join '("/run/setuid-programs"
+                                         "/run/current-system/profile/bin"
+                                         "/run/current-system/profile/sbin")
+                                       ":"))
+           ;; Put GDM in bindir so that glib-or-gtk-build-system wraps the
+           ;; XDG_DATA_DIRS so that it finds its schemas.
+           "--sbindir" (string-append #$output "/bin"))
        #:phases
        (modify-phases %standard-phases
          (add-before
-          'configure 'pre-configure
-          (lambda* (#:key inputs outputs #:allow-other-keys)
-            ;; We don't have <systemd/sd-daemon.h>.
-            (substitute* '("common/gdm-log.c"
-                           "daemon/gdm-server.c"
-                           "daemon/gdm-session-worker.c"
-                           "daemon/gdm-session-worker-job.c")
-              (("#include <systemd/sd-daemon\\.h>") ""))
-            ;; Use elogind for sd-login.
-            (substitute* '("common/gdm-common.c"
-                           "daemon/gdm-local-display-factory.c"
-                           "daemon/gdm-manager.c"
-                           "libgdm/gdm-user-switching.c")
-              (("#include <systemd/sd-login\\.h>")
-               "#include <elogind/sd-login.h>"))
-            ;; Check for elogind.
-            (substitute* '("configure")
-              (("libsystemd")
-               "libelogind"))
-            ;; Look for system-installed sessions in
-            ;; /run/current-system/profile/share.
-            (substitute* '("libgdm/gdm-sessions.c"
-                           "daemon/gdm-session.c"
-                           "daemon/gdm-display.c"
-                           "daemon/gdm-launch-environment.c")
-              (("DATADIR \"/x")
-               "\"/run/current-system/profile/share/x")
-              (("DATADIR \"/wayland")
-               "\"/run/current-system/profile/share/wayland")
-              (("DATADIR \"/gnome")
-               "\"/run/current-system/profile/share/gnome"))
-            (let ((propagate '("GDM_CUSTOM_CONF"
-                               "GDM_DBUS_DAEMON"
-                               "GDM_X_SERVER"
-                               "GDM_X_SESSION"
-                               ;; XXX: Remove this once GNOME Shell is
-                               ;; a dependency of GDM.
-                               "XDG_DATA_DIRS")))
-              (substitute* "daemon/gdm-session.c"
-                (("set_up_session_environment \\(self\\);")
-                 (apply string-append
-                        "set_up_session_environment (self);\n"
-                        (map (lambda (name)
-                               (string-append
-                                "gdm_session_set_environment_variable "
-                                "(self, \"" name "\","
-                                "g_getenv (\"" name "\"));\n"))
-                             propagate)))))
-            ;; Find the configuration file using an environment variable.
-            (substitute* '("common/gdm-settings.c")
-              (("GDM_CUSTOM_CONF")
-               (string-append "(g_getenv(\"GDM_CUSTOM_CONF\") != NULL"
-                              " ? g_getenv(\"GDM_CUSTOM_CONF\")"
-                              " : GDM_CUSTOM_CONF)")))
-            ;; Use service-supplied path to X.
-            (substitute* '("daemon/gdm-server.c")
-              (("\\(X_SERVER X_SERVER_ARG_FORMAT")
-               "(\"%s\" X_SERVER_ARG_FORMAT, g_getenv (\"GDM_X_SERVER\")"))
-            (substitute* '("daemon/gdm-wayland-session.c"
-                           "daemon/gdm-x-session.c")
-              (("\"dbus-daemon\"")
-               "g_getenv (\"GDM_DBUS_DAEMON\")")
-              (("X_SERVER")
-               "g_getenv (\"GDM_X_SERVER\")")
-              (("GDMCONFDIR \"/Xsession\"")
-               "g_getenv (\"GDM_X_SESSION\")"))
-            ;; Use an absolute path for GNOME Session.
-            (substitute* "daemon/gdm-launch-environment.c"
-              (("\"gnome-session\"")
-               (string-append "\"" (assoc-ref inputs "gnome-session")
-                              "/bin/gnome-session\"")))
-            ;; Do not automatically select the placeholder session.
-            (substitute* "daemon/gdm-session.c"
-              (("!g_str_has_suffix [(]base_name, \"\\.desktop\"[)]")
-               (string-append "!g_str_has_suffix (base_name, \".desktop\") || "
-                              "(g_strcmp0(search_dirs[i], \""
-                              (assoc-ref outputs "out") "/share/gdm/BuiltInSessions/"
-                              "\") == 0 && "
-                              "g_strcmp0(base_name, \"fail.desktop\") == 0)"))
-              (("g_error [(]\"GdmSession: no session desktop files installed, aborting\\.\\.\\.\"[)];")
-               "{ self->fallback_session_name = g_strdup(\"fail\"); goto out; }"))
-            #t))
+             'configure 'pre-configure
+           (lambda* (#:key inputs outputs #:allow-other-keys)
+             ;; We don't have <systemd/sd-daemon.h>.
+             (substitute* '("common/gdm-log.c"
+                            "daemon/gdm-server.c"
+                            "daemon/gdm-session-worker.c"
+                            "daemon/gdm-session-worker-job.c")
+               (("#include <systemd/sd-daemon\\.h>") ""))
+             ;; Use elogind for sd-login.
+             (substitute* '("common/gdm-common.c"
+                            "daemon/gdm-local-display-factory.c"
+                            "daemon/gdm-manager.c"
+                            "libgdm/gdm-user-switching.c")
+               (("#include <systemd/sd-login\\.h>")
+                "#include <elogind/sd-login.h>"))
+             ;; Look for system-installed sessions in
+             ;; /run/current-system/profile/share.
+             (substitute* '("libgdm/gdm-sessions.c"
+                            "daemon/gdm-session.c"
+                            "daemon/gdm-display.c"
+                            "daemon/gdm-launch-environment.c")
+               (("DATADIR \"/x")
+                "\"/run/current-system/profile/share/x")
+               (("DATADIR \"/wayland")
+                "\"/run/current-system/profile/share/wayland")
+               (("DATADIR \"/gnome")
+                "\"/run/current-system/profile/share/gnome"))
+             (let ((propagate '("GDM_CUSTOM_CONF"
+                                "GDM_DBUS_DAEMON"
+                                "GDM_X_SERVER"
+                                "GDM_X_SESSION"
+                                ;; XXX: Remove this once GNOME Shell is
+                                ;; a dependency of GDM.
+                                "XDG_DATA_DIRS")))
+               (substitute* "daemon/gdm-session.c"
+                 (("set_up_session_environment \\(self\\);")
+                  (apply string-append
+                         "set_up_session_environment (self);\n"
+                         (map (lambda (name)
+                                (string-append
+                                 "gdm_session_set_environment_variable "
+                                 "(self, \"" name "\","
+                                 "g_getenv (\"" name "\"));\n"))
+                              propagate)))))
+             ;; Find the configuration file using an environment variable.
+             (substitute* '("common/gdm-settings.c")
+               (("GDM_CUSTOM_CONF")
+                (string-append "(g_getenv(\"GDM_CUSTOM_CONF\") != NULL"
+                               " ? g_getenv(\"GDM_CUSTOM_CONF\")"
+                               " : GDM_CUSTOM_CONF)")))
+             ;; Use service-supplied path to X.
+             (substitute* '("daemon/gdm-server.c")
+               (("\\(X_SERVER X_SERVER_ARG_FORMAT")
+                "(\"%s\" X_SERVER_ARG_FORMAT, g_getenv (\"GDM_X_SERVER\")"))
+             (substitute* '("daemon/gdm-wayland-session.c"
+                            "daemon/gdm-x-session.c")
+               (("\"dbus-daemon\"")
+                "g_getenv (\"GDM_DBUS_DAEMON\")")
+               (("X_SERVER")
+                "g_getenv (\"GDM_X_SERVER\")")
+               (("GDMCONFDIR \"/Xsession\"")
+                "g_getenv (\"GDM_X_SESSION\")"))
+             ;; Use an absolute path for GNOME Session.
+             (substitute* "daemon/gdm-launch-environment.c"
+               (("\"gnome-session\"")
+                (string-append "\"" (assoc-ref inputs "gnome-session")
+                               "/bin/gnome-session\"")))
+             ;; Do not automatically select the placeholder session.
+             (substitute* "daemon/gdm-session.c"
+               (("!g_str_has_suffix [(]base_name, \"\\.desktop\"[)]")
+                (string-append "!g_str_has_suffix (base_name, \".desktop\") || "
+                               "(g_strcmp0(search_dirs[i], \""
+                               (assoc-ref outputs "out") "/share/gdm/BuiltInSessions/"
+                               "\") == 0 && "
+                               "g_strcmp0(base_name, \"fail.desktop\") == 0)"))
+               (("g_error [(]\"GdmSession: no session desktop files installed, aborting\\.\\.\\.\"[)];")
+                "{ self->fallback_session_name = g_strdup(\"fail\"); goto out; }"))))
          ;; GDM requires that there be at least one desktop entry
          ;; file.  This phase installs a hidden one that simply
          ;; fails.  This enables users to use GDM with a
@@ -8259,8 +8263,7 @@ library.")
                       "Name=Fail\n"
                       "Comment=This session fails immediately.\n"
                       "NoDisplay=true\n"
-                      "Exec=false\n"))))
-               #t)))
+                      "Exec=false\n")))))))
          ;; GDM needs GNOME Session to run these applications.  We link
          ;; their autostart files in `share/gdm/greeter/autostart'
          ;; because GDM explicitly tells GNOME Session to look there.
@@ -8277,8 +8280,8 @@ library.")
                (with-directory-excursion autostart
                  (for-each (lambda (desktop)
                              (symlink desktop (basename desktop)))
-                           (find-files (string-append settings "/etc/xdg"))))
-               #t))))))
+                           (find-files
+                            (string-append settings "/etc/xdg"))))))))))
     (native-inputs
      `(("dconf" ,dconf)
        ("glib:bin" ,glib "bin") ; for glib-compile-schemas, etc.
@@ -8291,6 +8294,7 @@ library.")
      `(("accountsservice" ,accountsservice)
        ("check" ,check-0.14)            ;for testing
        ("elogind" ,elogind)
+       ("eudev" ,eudev)
        ("gnome-session" ,gnome-session)
        ("gnome-settings-daemon" ,gnome-settings-daemon)
        ("gtk+" ,gtk+)
diff --git a/gnu/packages/patches/gdm-default-session.patch b/gnu/packages/patches/gdm-default-session.patch
index 9ab2829cdb..3ff8d0da7c 100644
--- a/gnu/packages/patches/gdm-default-session.patch
+++ b/gnu/packages/patches/gdm-default-session.patch
@@ -4,11 +4,9 @@ and not in the directories listed in $XDG_DATA_DIRS.  The latter includes
 /run/current-system/profile, and only then.
 
 Fixes <https://bugs.gnu.org/37831>.
-
-diff -ur a/daemon/gdm-session.c b/daemon/gdm-session.c
---- a/daemon/gdm-session.c	2019-09-25 10:40:24.000000000 -0400
-+++ b/daemon/gdm-session.c	2020-04-18 18:30:02.671856808 -0400
-@@ -348,24 +348,18 @@
+--- a/daemon/gdm-session.c	2021-07-23 15:16:15.164201000 +0000
++++ b/daemon/gdm-session.c	2021-09-26 08:18:58.730134555 +0000
+@@ -354,13 +354,12 @@
          GArray *search_array = NULL;
          char **search_dirs;
          int i;
@@ -19,22 +17,23 @@ diff -ur a/daemon/gdm-session.c b/daemon/gdm-session.c
                  DMCONFDIR "/Sessions/",
                  DATADIR "/gdm/BuiltInSessions/",
 -                DATADIR "/xsessions/",
-+                "/run/current-system/profile/share/xsessions/"
++                "/run/current-system/profile/share/xsessions/",
          };
  
          static const char *wayland_search_dir = DATADIR "/wayland-sessions/";
- 
+@@ -368,11 +367,6 @@
          search_array = g_array_new (TRUE, TRUE, sizeof (char *));
  
--        for (i = 0; system_data_dirs[i]; i++) {
--                gchar *dir = g_build_filename (system_data_dirs[i], "xsessions", NULL);
--                g_array_append_val (search_array, dir);
--        }
+         if (type == NULL || g_str_equal (type, "x11")) {
+-                for (i = 0; system_data_dirs[i]; i++) {
+-                        gchar *dir = g_build_filename (system_data_dirs[i], "xsessions", NULL);
+-                        g_array_append_val (search_array, dir);
+-                }
 -
-         g_array_append_vals (search_array, x_search_dirs, G_N_ELEMENTS (x_search_dirs));
+                 g_array_append_vals (search_array, x_search_dirs, G_N_ELEMENTS (x_search_dirs));
+         }
  
- #ifdef ENABLE_WAYLAND_SUPPORT
-@@ -373,16 +367,7 @@
+@@ -382,16 +376,7 @@
  #ifdef ENABLE_USER_DISPLAY_SERVER
                  g_array_prepend_val (search_array, wayland_search_dir);
  
diff --git a/gnu/packages/patches/gdm-elogind-support.patch b/gnu/packages/patches/gdm-elogind-support.patch
new file mode 100644
index 0000000000..39cd12dd22
--- /dev/null
+++ b/gnu/packages/patches/gdm-elogind-support.patch
@@ -0,0 +1,211 @@
+https://gitlab.gnome.org/GNOME/gdm/-/merge_requests/113
+
+From 462cc0f5346f5913cf7151044f1c232c5d21c1c3 Mon Sep 17 00:00:00 2001
+From: Dudemanguy <random342@airmail.cc>
+Date: Mon, 5 Oct 2020 18:41:55 -0500
+Subject: [PATCH] meson: allow building with elogind
+
+Currently, the GDM meson build has a hard dependency on systemd.
+However, GDM can function just fine if one is using elogind. This allows
+a user to build GDM against libelogind and also disable the systemd
+system and user units.
+---
+ common/meson.build                       |  2 +-
+ data/meson.build                         | 62 ++++++++++++++----------
+ data/pam-arch/gdm-launch-environment.pam |  1 +
+ libgdm/meson.build                       |  2 +-
+ meson.build                              | 36 +++++++++-----
+ meson_options.txt                        |  5 +-
+ 6 files changed, 66 insertions(+), 42 deletions(-)
+
+diff --git a/common/meson.build b/common/meson.build
+index 074dd92e1..bca58f7c4 100644
+--- a/common/meson.build
++++ b/common/meson.build
+@@ -11,7 +11,7 @@ libgdmcommon_src = files(
+ )
+ 
+ libgdmcommon_deps = [
+-  libsystemd_dep,
++  logind_dep,
+   gobject_dep,
+   gio_dep,
+   gio_unix_dep,
+diff --git a/data/meson.build b/data/meson.build
+index 7c5222eaf..403336c31 100644
+--- a/data/meson.build
++++ b/data/meson.build
+@@ -168,41 +168,53 @@ else
+   service_config.set('PLYMOUTH_QUIT_SERVICE', '')
+ endif
+ 
+-if get_option('systemdsystemunitdir') != ''
+-  systemd_systemunitdir = get_option('systemdsystemunitdir')
+-else
+-  systemd_systemunitdir = systemd_dep.get_pkgconfig_variable('systemdsystemunitdir')
++systemdsystemunitdir = get_option('systemdsystemunitdir')
++if systemdsystemunitdir != 'no'
++  assert(systemd_dep.found(), 'systemd required but not found, please provide a valid systemd system unit dir or disable it')
++  if get_option('systemdsystemunitdir') != ''
++    systemd_systemunitdir = get_option('systemdsystemunitdir')
++  else
++    systemd_systemunitdir = systemd_dep.get_pkgconfig_variable('systemdsystemunitdir')
++  endif
+ endif
+ 
+-if get_option('systemduserunitdir') != ''
+-  systemd_userunitdir = get_option('systemduserunitdir')
+-else
+-  systemd_userunitdir = systemd_dep.get_pkgconfig_variable('systemduserunitdir',
+-                                                           define_variable: ['prefix', get_option('prefix')])
++systemduserunitdir = get_option('systemduserunitdir')
++if systemduserunitdir != 'no'
++  assert(systemd_dep.found(), 'systemd required but not found, please provide a valid systemd user unit dir or disable it')
++  if get_option('systemduserunitdir') != ''
++    systemd_userunitdir = get_option('systemduserunitdir')
++  else
++    systemd_userunitdir = systemd_dep.get_pkgconfig_variable('systemduserunitdir',
++                                                             define_variable: ['prefix', get_option('prefix')])
++  endif
+ endif
+ 
+-configure_file(
+-  input: 'gdm.service.in',
+-  output: '@BASENAME@',
+-  configuration: service_config,
+-  install_dir: systemd_systemunitdir,
+-  format: 'cmake'
+-)
++if systemdsystemunitdir != 'no'
++  configure_file(
++    input: 'gdm.service.in',
++    output: '@BASENAME@',
++    configuration: service_config,
++    install_dir: systemd_systemunitdir,
++    format: 'cmake'
++  )
++endif
+ 
+ gdm_gnome_session_wanted_targets = []
+ foreach component: gdm_gnome_user_session_wanted_components
+   gdm_gnome_session_wanted_targets += 'Wants=@0@.target'.format(component)
+ endforeach
+ 
+-configure_file(
+-  input: 'session.conf.in',
+-  output: 'session.conf',
+-  configuration: {
+-    'requires_component': gdm_gnome_shell_component,
+-    'wants_required_components': '\n'.join(gdm_gnome_session_wanted_targets),
+-  },
+-  install_dir: systemd_userunitdir / 'gnome-session@gnome-login.target.d',
+-)
++if systemduserunitdir != 'no'
++  configure_file(
++    input: 'session.conf.in',
++    output: 'session.conf',
++    configuration: {
++      'requires_component': gdm_gnome_shell_component,
++      'wants_required_components': '\n'.join(gdm_gnome_session_wanted_targets),
++    },
++    install_dir: systemd_userunitdir / 'gnome-session@gnome-login.target.d',
++  )
++endif
+ 
+ # XSession
+ if get_option('gdm-xsession')
+diff --git a/libgdm/meson.build b/libgdm/meson.build
+index 3f8cafbb7..83e95151b 100644
+--- a/libgdm/meson.build
++++ b/libgdm/meson.build
+@@ -56,7 +56,7 @@ libgdm_deps = [
+   glib_dep,
+   gio_dep,
+   gio_unix_dep,
+-  libsystemd_dep,
++  logind_dep,
+   libgdmcommon_dep,
+ ]
+ 
+diff --git a/meson.build b/meson.build
+index e6fcf4b8b..a86a486b7 100644
+--- a/meson.build
++++ b/meson.build
+@@ -92,21 +92,30 @@ xdmcp_dep = cc.find_library('Xdmcp', required: get_option('xdmcp'))
+ if xdmcp_dep.found() and get_option('tcp-wrappers')
+   libwrap_dep = cc.find_library('libwrap')
+ endif
+-# systemd
+-systemd_dep = dependency('systemd')
+-libsystemd_dep = dependency('libsystemd')
+-if meson.version().version_compare('>= 0.53')
+-  systemd_multiseat_x = find_program('systemd-multi-seat-x',
+-    required: false,
+-    dirs: [
+-      systemd_dep.get_pkgconfig_variable('systemdutildir'),
+-      '/lib/systemd',
+-      '/usr/lib/systemd',
+-    ])
++
++logind_provider = get_option('logind-provider')
++systemd_dep = dependency('systemd', required: false)
++if logind_provider == 'systemd'
++  libsystemd_dep = dependency('libsystemd')
++  logind_dep = libsystemd_dep
++  if meson.version().version_compare('>= 0.53')
++    systemd_multiseat_x = find_program('systemd-multi-seat-x',
++      required: false,
++      dirs: [
++        systemd_dep.get_pkgconfig_variable('systemdutildir'),
++        '/lib/systemd',
++        '/usr/lib/systemd',
++      ])
++  else
++    systemd_multiseat_x = find_program('systemd-multi-seat-x', required: false)
++  endif
++  systemd_x_server = systemd_multiseat_x.found()? systemd_multiseat_x.path() : '/lib/systemd/systemd-multi-seat-x'
+ else
+-  systemd_multiseat_x = find_program('systemd-multi-seat-x', required: false)
++  elogind_dep = dependency('libelogind')
++  logind_dep = elogind_dep
++  systemd_x_server = 'disabled'
+ endif
+-systemd_x_server = systemd_multiseat_x.found()? systemd_multiseat_x.path() : '/lib/systemd/systemd-multi-seat-x'
++
+ # Plymouth
+ plymouth_dep = dependency('ply-boot-client', required: get_option('plymouth'))
+ # Check for Solaris auditing API (ADT)
+@@ -313,6 +322,7 @@ summary({
+     'PAM Syslog': have_pam_syslog,
+     'Supports PAM Extensions': pam_extensions_supported,
+     'SeLinux': libselinux_dep.found(),
++    'Logind Provider': get_option('logind-provider'),
+     'Use GDM Xsession': get_option('gdm-xsession'),
+     'Use UserDisplayServer': get_option('user-display-server'),
+     'Use SystemdJournal': get_option('systemd-journal'),
+diff --git a/meson_options.txt b/meson_options.txt
+index 14e0b908b..5135d7d66 100644
+--- a/meson_options.txt
++++ b/meson_options.txt
+@@ -12,6 +12,7 @@ option('initial-vt', type: 'integer', value: 1, description: 'Initial virtual te
+ option('ipv6', type: 'boolean', value: false, description: 'Enables compilation of IPv6 code.')
+ option('lang-file', type: 'string', value: '', description: 'File containing default language settings.')
+ option('libaudit', type: 'feature', value: 'auto', description: 'Add Linux audit support.')
++option('logind-provider', type: 'combo', choices: ['systemd', 'elogind'], value: 'systemd', description: 'Which logind library to use.')
+ option('log-dir', type: 'string', value: '/var/log/gdm', description: 'Log directory.')
+ option('pam-mod-dir', type: 'string', value: '', description: 'Directory to install PAM modules in.')
+ option('pam-prefix', type: 'string', value: '', description: 'Specify where PAM files go.')
+@@ -27,8 +28,8 @@ option('solaris', type: 'boolean', value: false, description: 'Build for Solaris
+ option('split-authentication', type: 'boolean', value: true, description: 'Enable multiple simultaneous PAM conversations during login.')
+ option('sysconfsubdir', type: 'string', value: 'gdm', description: 'Directory name used under sysconfdir.')
+ option('systemd-journal', type: 'boolean', value: true, description: 'Use journald support.')
+-option('systemdsystemunitdir', type: 'string', value: '', description: 'Directory for systemd service files.')
+-option('systemduserunitdir', type: 'string', value: '', description: 'Directory for systemd user service files.')
++option('systemdsystemunitdir', type: 'string', value: '', description: 'Directory for systemd service files, or \'no\' to disable.')
++option('systemduserunitdir', type: 'string', value: '', description: 'Directory for systemd user service files, or \'no\' to disable.')
+ option('tcp-wrappers', type: 'boolean', value: false, description: 'Use TCP wrappers.')
+ option('udev-dir', type: 'string', value: '', description: 'Directory for udev rules file.')
+ option('user', type: 'string', value: 'gdm', description: 'GDM\'s username.')
+-- 
+GitLab
+