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-rw-r--r--ext/readline/extconf.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/ext/readline/extconf.rb b/ext/readline/extconf.rb
index 5e3c9ea..70dfd0b 100644
--- a/ext/readline/extconf.rb
+++ b/ext/readline/extconf.rb
@@ -99,6 +99,9 @@ readline.have_func("rl_redisplay")
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