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-rw-r--r--lib/mkmf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index d8bc1b525d..2904dc0589 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1,4 +1,5 @@
# -*- coding: us-ascii -*-
+# frozen_string_literal: false
# frozen-string-literal: false
# module to create Makefile for extension modules
# invoke like: ruby -r mkmf extconf.rb