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-rw-r--r--ext/readline/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/readline/extconf.rb b/ext/readline/extconf.rb
index 84fb9b14a6..1d74e29124 100644
--- a/ext/readline/extconf.rb
+++ b/ext/readline/extconf.rb
@@ -58,6 +58,7 @@ have_readline_var("rl_completer_quote_characters")
have_readline_var("rl_filename_quote_characters")
have_readline_var("rl_attempted_completion_over")
have_readline_var("rl_library_version")
+have_readline_var("rl_editing_mode")
# workaround for native windows.
/mswin|bccwin|mingw/ !~ RUBY_PLATFORM && have_readline_var("rl_event_hook")
have_readline_func("rl_cleanup_after_signal")