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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 5cbcc0ef7d..776ab19ba8 100644
--- a/ext/readline/extconf.rb
+++ b/ext/readline/extconf.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require "mkmf"
readline = Struct.new(:headers, :extra_check).new(["stdio.h"])