Andrew, in randrik15, I think this patch is inconsistent.  Could you recheck?

then 0042 - should be simple in that it adds exr sequence as format for background render

That is:   0042-Add-openEXR-format-for-background-render.patch

@@ -92,7 +92,10 @@ void FormatPopup::create_objects()
        if(!use_brender)
                post_item(FILE_TIFF);
        post_item(FILE_TIFF_LIST);
-
+#ifdef HAVE_OPENEXR
+       if(use_brender)              */ should this not be:   if (!use_brender) like the ones above?  */
+       post_item(FILE_EXR_LIST);
+#endif
        update(&format_items, 0, 0, 1);
 }