--- mod_clamav-0.23/mod_clamav.h~	2009-04-11 01:37:29.000000000 +0200
+++ mod_clamav-0.23/mod_clamav.h	2021-10-20 22:57:08.055181300 +0200
@@ -98,7 +98,7 @@
 #define MOD_CLAMAV_INFECTED_STATUS	"INFECTED"
 #define MOD_CLAMAV_FAILED_STATUS	"failed"
 
-module AP_MODULE_DECLARE_DATA clamav_module;
+extern module AP_MODULE_DECLARE_DATA clamav_module;
 
 /* the clamav statistics context */
 #define	VIRUS_LIST_LENGTH	10