solves error: conflicting types for ‘strcasestr’; https://notes.sagredo.eu/en/qmail-notes-185/autorespond-24.html#comment3929 diff -ruN autorespond-2.0.5-original/autorespond.c autorespond-2.0.5/autorespond.c --- autorespond-2.0.5-original/autorespond.c 2003-09-18 22:17:57.000000000 +0200 +++ autorespond-2.0.5/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;