diff --git a/ChangeLog b/ChangeLog
index 4397748230..6b8c0a2e15 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri May 18 15:49:35 2012  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* ext/readline/extconf.rb: Use an exception instead of bare exit.
+
 Fri May 18 15:38:11 2012  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 
 	* ext/ripper/extconf.rb: Use an exception instead of bare
diff --git a/ext/readline/extconf.rb b/ext/readline/extconf.rb
index 7968de35f5..737ca749ee 100644
--- a/ext/readline/extconf.rb
+++ b/ext/readline/extconf.rb
@@ -40,14 +40,14 @@ when true
   unless (have_readline_header("editline/readline.h") ||
           have_readline_header("readline/readline.h")) &&
           have_library("edit", "readline")
-    exit
+    raise "libedit not found"
   end
 when false
   # --disable-libedit
   unless ((have_readline_header("readline/readline.h") &&
            have_readline_header("readline/history.h")) &&
            have_library("readline", "readline"))
-    exit
+    raise "readline not found"
   end
 else
   # does not specify
@@ -57,7 +57,7 @@ else
             have_library("edit", "readline"))) ||
             (have_readline_header("editline/readline.h") &&
              have_library("edit", "readline"))
-    exit
+    raise "readline nor libedit not found"
   end
 end