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-rwxr-xr-xext/tk/lib/tkextlib/pkg_checker.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/tkextlib/pkg_checker.rb b/ext/tk/lib/tkextlib/pkg_checker.rb
index e2fd97bb6a..76a25ca629 100755
--- a/ext/tk/lib/tkextlib/pkg_checker.rb
+++ b/ext/tk/lib/tkextlib/pkg_checker.rb
@@ -1,4 +1,5 @@
#!/usr/bin/env ruby
+# frozen_string_literal: false
#
# Ruby/Tk extension library checker
#