diff --git a/ext/readline/extconf.rb b/ext/readline/extconf.rb
index c79370b..5cbcc0e 100644
--- a/ext/readline/extconf.rb
+++ b/ext/readline/extconf.rb
@@ -37,6 +37,7 @@ def readline.have_type(type)
 case enable_libedit
 when true
   # --enable-libedit
+  dir_config("libedit")
   unless (readline.have_header("editline/readline.h") ||
           readline.have_header("readline/readline.h")) &&
           have_library("edit", "readline")