--- geeqie-2.1/src/lua.cc	2023-06-17 14:12:30.000000000 +0200
+++ geeqie-2.1/src/lua.cc.new	2023-07-13 11:28:14.538188452 +0200
@@ -24,9 +24,11 @@
 
 #define _XOPEN_SOURCE
 
+extern "C" {
 #include <lua.h>
 #include <lauxlib.h>
 #include <lualib.h>
+}
 
 #include <stdio.h>
 #include <glib.h>