Adjust search paths so GIR typelibs and GLib schemas are found.
Adapted from Nixpkgs: <https://github.com/NixOS/nixpkgs/tree/master/pkgs/by-name/gp/gpaste>.

diff --git a/src/gnome-shell/extension.js b/src/gnome-shell/extension.js
index cb862a30..6c24175b 100644
--- a/src/gnome-shell/extension.js
+++ b/src/gnome-shell/extension.js
@@ -4,6 +4,9 @@
  * Copyright (c) 2010-2023, Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
  */
 
+import GIRepository from 'gi://GIRepository';
+GIRepository.Repository.prepend_search_path('@typelibDir@');
+
 import * as Main from 'resource:///org/gnome/shell/ui/main.js';
 import {Extension, gettext as _} from 'resource:///org/gnome/shell/extensions/extension.js';
 
diff --git a/src/gnome-shell/prefs.js b/src/gnome-shell/prefs.js
index 4c0d9bde..6a376b32 100644
--- a/src/gnome-shell/prefs.js
+++ b/src/gnome-shell/prefs.js
@@ -4,6 +4,9 @@
  * Copyright (c) 2010-2023, Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
  */
 
+import GIRepository from 'gi://GIRepository';
+GIRepository.Repository.prepend_search_path('@typelibDir@');
+
 import { ExtensionPreferences, gettext as _ } from 'resource:///org/gnome/Shell/Extensions/js/extensions/prefs.js';
 
 import GPasteGtk from 'gi://GPasteGtk?version=4';
diff --git a/src/libgpaste/gpaste/gpaste-settings.c b/src/libgpaste/gpaste/gpaste-settings.c
index 830f5e0b..c8df0e11 100644
--- a/src/libgpaste/gpaste/gpaste-settings.c
+++ b/src/libgpaste/gpaste/gpaste-settings.c
@@ -1039,7 +1039,10 @@ create_g_settings (void)
     }
     else
     {
-        return g_settings_new (G_PASTE_SETTINGS_NAME);
+        // library used by introspection requires schemas but we cannot set XDG_DATA_DIRS for the library
+        g_autoptr (GSettingsSchemaSource) schema_source = g_settings_schema_source_new_from_directory ("@gschemasCompiled@", NULL, FALSE, NULL);
+        g_autoptr (GSettingsSchema) schema = g_settings_schema_source_lookup (schema_source, G_PASTE_SETTINGS_NAME, FALSE);
+        return g_settings_new_full (schema, NULL, NULL);
     }
 }