diff --git a/meson.build b/meson.build
index 61f34ec..78ebe84 100644
--- a/meson.build
+++ b/meson.build
@@ -145,7 +145,7 @@ python3_available_modules = []
 
 foreach module, required : python3_test_modules
     if required and run_command(python3, '-c', 'import @0@'.format(module)).returncode() != 0
-        warning('Python3 module \'' + module + '\' required by test suite not found')
+        error('Python3 module \'' + module + '\' required by test suite not found')
     endif
 endforeach
 
diff --git a/src/fprintd.h b/src/fprintd.h
index 63a742e..4075bc2 100644
--- a/src/fprintd.h
+++ b/src/fprintd.h
@@ -91,18 +91,3 @@ FprintDevice *fprint_device_new (FpDevice *dev);
 guint32 _fprint_device_get_id (FprintDevice *rdev);
 /* Print */
 /* TODO */
-
-
-/* Some compatibility definitions for older GLib. Copied from from libfprint. */
-#if !GLIB_CHECK_VERSION (2, 57, 0)
-G_DEFINE_AUTOPTR_CLEANUP_FUNC (GTypeClass, g_type_class_unref);
-G_DEFINE_AUTOPTR_CLEANUP_FUNC (GEnumClass, g_type_class_unref);
-G_DEFINE_AUTOPTR_CLEANUP_FUNC (GFlagsClass, g_type_class_unref);
-G_DEFINE_AUTOPTR_CLEANUP_FUNC (GParamSpec, g_param_spec_unref);
-#else
-/* Re-define G_SOURCE_FUNC as we are technically not allowed to use it with
- * the version we depend on currently. */
-#undef G_SOURCE_FUNC
-#endif
-
-#define G_SOURCE_FUNC(f) ((GSourceFunc) (void (*)(void))(f))