--- ./src/swanctl/swanctl.h.xiugai	2021-08-03 19:08:13.634660548 +0800
+++ ./src/swanctl/swanctl.h	2021-08-03 19:08:30.770825041 +0800
@@ -30,7 +30,7 @@
 /**
  * Base directory for credentials and config
  */
-char *swanctl_dir;
+extern char *swanctl_dir;
 
 /**
  * Configuration file for connections, etc.