--- libxml2-2.10.0/xmlIO.c.orig	2022-08-18 16:29:32.843322082 +0200
+++ libxml2-2.10.0/xmlIO.c	2022-08-18 16:32:12.985787850 +0200
@@ -1115,8 +1115,33 @@ xmlGzfileOpen_real (const char *filename
 
     if (path == NULL)
 	return(NULL);
-    if (!xmlCheckFilename(path))
-        return(NULL);
+    if (!xmlCheckFilename(path)) {
+	/* If we cannot open `foo.xml', we try `foo.xml.gz'. However we i
+	 * append .gz only if filename doesn't alreay end with .gz. */
+	if (strlen(path) < 3 || strcmp(path + strlen(path) - 3, ".gz") != 0) {
+	    char *gz_filename = xmlMalloc(strlen(path) + 4);
+
+	    if (gz_filename == NULL) {
+	        xmlGenericError(xmlGenericErrorContext,
+			        "xmlGzfileOpen:  %s\n",
+			        "Failure allocating buffer for filename.");
+	        return NULL;
+	    }
+
+	    strcpy(gz_filename, path);
+	    strcat(gz_filename, ".gz");
+
+	    fd = NULL;
+
+	    if (xmlCheckFilename(gz_filename))
+		fd = gzopen(gz_filename, "rb");
+
+	    xmlFree(gz_filename);
+	     
+	    return((void *) fd);
+	} else
+	    return NULL;
+    }
 
 #if defined(_WIN32)
     fd = xmlWrapGzOpenUtf8(path, "rb");