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-rw-r--r--ext/stringio/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/stringio/extconf.rb b/ext/stringio/extconf.rb
index 8fc84b3..ad8650d 100644
--- a/ext/stringio/extconf.rb
+++ b/ext/stringio/extconf.rb
@@ -1,2 +1,3 @@
+# frozen_string_literal: false
require 'mkmf'
create_makefile('stringio')