--- autorespond-2.0.5-original/autorespond.c	2003-09-18 22:17:57.000000000 +0200
+++ autorespond-2.0.5-original/autorespond.c	2024-03-30 19:02:26.546423832 +0100
@@ -376,7 +376,7 @@ 
 /*********************************************************
 ** find string in string - ignore case **/
 
-char *strcasestr( char *_s1, char *_s2 )
+char *strcasestr( const char *_s1, const char *_s2 )
 {
 	char *s1;
 	char *s2;