diff --git a/pkgs/desktops/gnome-3/core/gdm/default.nix b/pkgs/desktops/gnome-3/core/gdm/default.nix
index 6b6b23f21b54..88fed09de382 100644
--- a/pkgs/desktops/gnome-3/core/gdm/default.nix
+++ b/pkgs/desktops/gnome-3/core/gdm/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, pkgconfig, glib, itstool, libxml2, xorg, dbus
+{ stdenv, fetchurl, substituteAll, pkgconfig, glib, itstool, libxml2, xorg, dbus
 , intltool, accountsservice, libX11, gnome3, systemd, autoreconfHook
 , gtk, libcanberra-gtk3, pam, libtool, gobjectIntrospection, plymouth
 , librsvg, coreutils }:
@@ -12,50 +12,56 @@ stdenv.mkDerivation rec {
     sha256 = "1yxjjyrp0ywrc25cp81bsdhp79zn0c0jag48hlp00b5wfnkqy1kp";
   };
 
-  passthru = {
-    updateScript = gnome3.updateScript { packageName = "gdm"; attrPath = "gnome3.gdm"; };
-  };
-
   # Only needed to make it build
   preConfigure = ''
     substituteInPlace ./configure --replace "/usr/bin/X" "${xorg.xorgserver.out}/bin/X"
   '';
 
-  postPatch = ''
-    substituteInPlace daemon/gdm-manager.c --replace "/bin/plymouth" "${plymouth}/bin/plymouth"
-    substituteInPlace data/gdm.service.in  --replace "/bin/kill" "${coreutils}/bin/kill"
-  '';
-
-  configureFlags = [ "--sysconfdir=/etc"
-                     "--localstatedir=/var"
-                     "--with-plymouth=yes"
-                     "--with-initial-vt=7"
-                     "--with-systemdsystemunitdir=$(out)/etc/systemd/system" ];
+  configureFlags = [
+    "--sysconfdir=/etc"
+    "--localstatedir=/var"
+    "--with-plymouth=yes"
+    "--with-initial-vt=7"
+    "--with-systemdsystemunitdir=$(out)/etc/systemd/system"
+  ];
 
   nativeBuildInputs = [ pkgconfig libxml2 itstool intltool autoreconfHook libtool gnome3.dconf ];
-  buildInputs = [ glib accountsservice systemd
-                  gobjectIntrospection libX11 gtk
-                  libcanberra-gtk3 pam plymouth librsvg ];
+  buildInputs = [
+    glib accountsservice systemd
+    gobjectIntrospection libX11 gtk
+    libcanberra-gtk3 pam plymouth librsvg
+  ];
 
   enableParallelBuilding = true;
 
   # Disable Access Control because our X does not support FamilyServerInterpreted yet
-  patches = [ ./sessions_dir.patch
-              ./gdm-x-session_extra_args.patch
-              ./gdm-session-worker_xserver-path.patch
-             ];
+  patches = [
+    (substituteAll {
+      src = ./fix-paths.patch;
+      inherit coreutils plymouth;
+    })
+    ./sessions_dir.patch
+    ./gdm-x-session_extra_args.patch
+    ./gdm-session-worker_xserver-path.patch
+  ];
 
-  postInstall = ''
-    # Prevent “Could not parse desktop file orca-autostart.desktop or it references a not found TryExec binary”
-    rm $out/share/gdm/greeter/autostart/orca-autostart.desktop
-  '';
+  installFlags = [
+    "sysconfdir=$(out)/etc"
+    "dbusconfdir=$(out)/etc/dbus-1/system.d"
+  ];
 
-  installFlags = [ "sysconfdir=$(out)/etc" "dbusconfdir=$(out)/etc/dbus-1/system.d" ];
+  passthru = {
+    updateScript = gnome3.updateScript {
+      packageName = "gdm";
+      attrPath = "gnome3.gdm";
+    };
+  };
 
   meta = with stdenv.lib; {
-    homepage = https://wiki.gnome.org/Projects/GDM;
     description = "A program that manages graphical display servers and handles graphical user logins";
-    platforms = platforms.linux;
+    homepage = https://wiki.gnome.org/Projects/GDM;
+    license = licenses.gpl2Plus;
     maintainers = gnome3.maintainers;
+    platforms = platforms.linux;
   };
 }
diff --git a/pkgs/desktops/gnome-3/core/gdm/fix-paths.patch b/pkgs/desktops/gnome-3/core/gdm/fix-paths.patch
new file mode 100644
index 000000000000..d10283d40eae
--- /dev/null
+++ b/pkgs/desktops/gnome-3/core/gdm/fix-paths.patch
@@ -0,0 +1,49 @@
+--- a/daemon/gdm-manager.c
++++ b/daemon/gdm-manager.c
+@@ -147,7 +147,7 @@
+         GError  *error;
+ 
+         error = NULL;
+-        res = g_spawn_command_line_sync ("/bin/plymouth --ping",
++        res = g_spawn_command_line_sync ("@plymouth@/bin/plymouth --ping",
+                                          NULL, NULL, &status, &error);
+         if (! res) {
+                 g_debug ("Could not ping plymouth: %s", error->message);
+@@ -165,7 +165,7 @@
+         GError  *error;
+ 
+         error = NULL;
+-        res = g_spawn_command_line_sync ("/bin/plymouth deactivate",
++        res = g_spawn_command_line_sync ("@plymouth@/bin/plymouth deactivate",
+                                          NULL, NULL, NULL, &error);
+         if (! res) {
+                 g_warning ("Could not deactivate plymouth: %s", error->message);
+@@ -180,7 +180,7 @@
+         GError  *error;
+ 
+         error = NULL;
+-        res = g_spawn_command_line_async ("/bin/plymouth quit --retain-splash", &error);
++        res = g_spawn_command_line_async ("@plymouth@/bin/plymouth quit --retain-splash", &error);
+         if (! res) {
+                 g_warning ("Could not quit plymouth: %s", error->message);
+                 g_error_free (error);
+@@ -196,7 +196,7 @@
+         GError  *error;
+ 
+         error = NULL;
+-        res = g_spawn_command_line_async ("/bin/plymouth quit", &error);
++        res = g_spawn_command_line_async ("@plymouth@/bin/plymouth quit", &error);
+         if (! res) {
+                 g_warning ("Could not quit plymouth: %s", error->message);
+                 g_error_free (error);
+--- a/data/gdm.service.in
++++ b/data/gdm.service.in
+@@ -28,7 +28,7 @@
+ StandardOutput=syslog
+ StandardError=inherit
+ EnvironmentFile=-@LANG_CONFIG_FILE@
+-ExecReload=/bin/kill -SIGHUP $MAINPID
++ExecReload=@coreutils@/bin/kill -SIGHUP $MAINPID
+ 
+ [Install]
+ Alias=display-manager.service