Ruby 2.0.0-p451(or p353/p247/p195/p0) readline 6.3.3 patch (original: https://gist.github.com/mislav/a18b9d7f0dc5b9efc162 in Ruby 2.1.1)

readline.patch

Index: ext/readline/extconf.rb
===================================================================
--- ext/readline/extconf.rb
+++ ext/readline/extconf.rb
@@ -19,6 +19,10 @@ def readline.have_func(func)
   return super(func, headers)
 end
 
+def readline.have_type(type)
+  return super(type, headers)
+end
+
 dir_config('curses')
 dir_config('ncurses')
 dir_config('termcap')
@@ -93,4 +97,10 @@ readline.have_func("remove_history")
 readline.have_func("clear_history")
 readline.have_func("rl_redisplay")
 readline.have_func("rl_insert_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
 create_makefile("readline")
Index: ext/readline/readline.c
===================================================================
--- ext/readline/readline.c
+++ ext/readline/readline.c
@@ -1883,7 +1883,7 @@ Init_readline()
 
     rl_attempted_completion_function = readline_attempted_completion_function;
 #if defined(HAVE_RL_PRE_INPUT_HOOK)
-    rl_pre_input_hook = (Function *)readline_pre_input_hook;
+    rl_pre_input_hook = (rl_hook_func_t *)readline_pre_input_hook;
 #endif
 #ifdef HAVE_RL_CATCH_SIGNALS
     rl_catch_signals = 0;

Thanks, works fine for ruby 2.0.0-p353.

Thanks!

Thanks report, Dexyne !
I check the other patch versions of 2.0.0, so this patch works ALL.
The description changed.

Thanks !
This patch works to install Ruby 2.0.0-p195 on Ubuntu 14.04 LTS.