https://github.com/termux/termux-packages/issues/18803
https://github.com/php/php-src/commit/0a39890c967aa57225bb6bdf4821aff7a3a3c082

--- a/ext/libxml/libxml.c
+++ b/ext/libxml/libxml.c
@@ -472,7 +472,11 @@
 	xmlResetError((xmlErrorPtr) ptr);
 }
 
+#if LIBXML_VERSION >= 21200
+static void _php_list_set_error_structure(const xmlError *error, const char *msg)
+#else
 static void _php_list_set_error_structure(xmlErrorPtr error, const char *msg)
+#endif
 {
 	xmlError error_copy;
 	int ret;
@@ -725,7 +729,11 @@
 	va_end(args);
 }
 
+#if LIBXML_VERSION >= 21200
+PHP_LIBXML_API void php_libxml_structured_error_handler(void *userData, const xmlError *error)
+#else
 PHP_LIBXML_API void php_libxml_structured_error_handler(void *userData, xmlErrorPtr error)
+#endif
 {
 	_php_list_set_error_structure(error, NULL);
 
@@ -957,11 +965,9 @@
 /* {{{ Retrieve last error from libxml */
 PHP_FUNCTION(libxml_get_last_error)
 {
-	xmlErrorPtr error;
-
 	ZEND_PARSE_PARAMETERS_NONE();
 
-	error = xmlGetLastError();
+	const xmlError *error = xmlGetLastError();
 
 	if (error) {
 		object_init_ex(return_value, libxmlerror_class_entry);