https://bugs.gentoo.org/826702
https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2155/diffs?commit_id=68858358544dd3b7e20663f731db22fd74a78a45 (cherry-picked relevant part)

--- a/ext/opencv/gstcvdilateerode.cpp
+++ b/ext/opencv/gstcvdilateerode.cpp
@@ -87,7 +87,7 @@ static void gst_cv_dilate_erode_get_property (GObject * object, guint prop_id,
 GType
 gst_cv_dilate_erode_get_type (void)
 {
-  static volatile gsize opencv_dilate_erode_type = 0;
+  static gsize opencv_dilate_erode_type = 0;

   if (g_once_init_enter (&opencv_dilate_erode_type)) {
     GType _type;