akr	2014-03-02 15:22:27 +0900 (Sun, 02 Mar 2014)

  New Revision: 45243

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=45243

  Log:
    A comment added.

  Modified files:
    trunk/ext/readline/extconf.rb
Index: ext/readline/extconf.rb
===================================================================
--- ext/readline/extconf.rb	(revision 45242)
+++ ext/readline/extconf.rb	(revision 45243)
@@ -99,6 +99,9 @@ readline.have_func("rl_redisplay") https://github.com/ruby/ruby/blob/trunk/ext/readline/extconf.rb#L99
 readline.have_func("rl_insert_text")
 readline.have_func("rl_delete_text")
 unless readline.have_type("rl_hook_func_t")
+  # rl_hook_func_t is available since readline-4.2 (2001).
+  # Function is removed at readline-6.3 (2014).
+  # However, editline (NetBSD 6.1.3, 2014) doesn't have rl_hook_func_t.
   $DEFS << "-Drl_hook_func_t=Function"
 end
 

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