Index: configure.ac
--- configure.ac.orig
+++ configure.ac
@@ -33,7 +33,7 @@ IRSSI_INCLUDE=`cd $with_irssi; pwd`
 
 AC_SUBST(IRSSI_INCLUDE)
 
-AS_IF([test ! -f "$IRSSI_INCLUDE/irssi-config"],
+AS_IF([test ! -f "$IRSSI_INCLUDE/irssi-config.h"],
       [AC_ERROR(Not irssi directory: $IRSSI_INCLUDE)]
 )
 
