19 files changed, 19 insertions, 0 deletions

diff --git a/ext/tk/lib/tkextlib/tkimg/bmp.rb b/ext/tk/lib/tkextlib/tkimg/bmp.rb
index ea90181aa3..48a3b7ef5f 100644
--- a/ext/tk/lib/tkextlib/tkimg/bmp.rb
+++ b/ext/tk/lib/tkextlib/tkimg/bmp.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'bmp'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkimg/dted.rb b/ext/tk/lib/tkextlib/tkimg/dted.rb
index cae833664c..30c595c1b6 100644
--- a/ext/tk/lib/tkextlib/tkimg/dted.rb
+++ b/ext/tk/lib/tkextlib/tkimg/dted.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'DTED'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkimg/gif.rb b/ext/tk/lib/tkextlib/tkimg/gif.rb
index d542d47561..ce5f3e94ec 100644
--- a/ext/tk/lib/tkextlib/tkimg/gif.rb
+++ b/ext/tk/lib/tkextlib/tkimg/gif.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'gif'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkimg/ico.rb b/ext/tk/lib/tkextlib/tkimg/ico.rb
index e79bdf45e9..80656005f0 100644
--- a/ext/tk/lib/tkextlib/tkimg/ico.rb
+++ b/ext/tk/lib/tkextlib/tkimg/ico.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'ico'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkimg/jpeg.rb b/ext/tk/lib/tkextlib/tkimg/jpeg.rb
index 2126120161..24e11a84de 100644
--- a/ext/tk/lib/tkextlib/tkimg/jpeg.rb
+++ b/ext/tk/lib/tkextlib/tkimg/jpeg.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'jpeg'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkimg/pcx.rb b/ext/tk/lib/tkextlib/tkimg/pcx.rb
index 6831f4d35b..942d585120 100644
--- a/ext/tk/lib/tkextlib/tkimg/pcx.rb
+++ b/ext/tk/lib/tkextlib/tkimg/pcx.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'pcx'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)#
diff --git a/ext/tk/lib/tkextlib/tkimg/pixmap.rb b/ext/tk/lib/tkextlib/tkimg/pixmap.rb
index bd1b870af7..b90468a108 100644
--- a/ext/tk/lib/tkextlib/tkimg/pixmap.rb
+++ b/ext/tk/lib/tkextlib/tkimg/pixmap.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'pixmap'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkimg/png.rb b/ext/tk/lib/tkextlib/tkimg/png.rb
index 5c829f48d2..76f7329772 100644
--- a/ext/tk/lib/tkextlib/tkimg/png.rb
+++ b/ext/tk/lib/tkextlib/tkimg/png.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'png'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkimg/ppm.rb b/ext/tk/lib/tkextlib/tkimg/ppm.rb
index eacfae467d..a6b705e6ad 100644
--- a/ext/tk/lib/tkextlib/tkimg/ppm.rb
+++ b/ext/tk/lib/tkextlib/tkimg/ppm.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'ppm'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkimg/ps.rb b/ext/tk/lib/tkextlib/tkimg/ps.rb
index 68e9178ac0..2a450ed157 100644
--- a/ext/tk/lib/tkextlib/tkimg/ps.rb
+++ b/ext/tk/lib/tkextlib/tkimg/ps.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'ps'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkimg/raw.rb b/ext/tk/lib/tkextlib/tkimg/raw.rb
index 5f1cdcaac0..2eddbbc43a 100644
--- a/ext/tk/lib/tkextlib/tkimg/raw.rb
+++ b/ext/tk/lib/tkextlib/tkimg/raw.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'Raw Data'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkimg/setup.rb b/ext/tk/lib/tkextlib/tkimg/setup.rb
index ee406c6ca0..cc967dced6 100644
--- a/ext/tk/lib/tkextlib/tkimg/setup.rb
+++ b/ext/tk/lib/tkextlib/tkimg/setup.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  setup.rb   --   setup script before calling TkPackage.require()
 #
diff --git a/ext/tk/lib/tkextlib/tkimg/sgi.rb b/ext/tk/lib/tkextlib/tkimg/sgi.rb
index ec7038bf0e..73a5bce0ac 100644
--- a/ext/tk/lib/tkextlib/tkimg/sgi.rb
+++ b/ext/tk/lib/tkextlib/tkimg/sgi.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'sgi'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkimg/sun.rb b/ext/tk/lib/tkextlib/tkimg/sun.rb
index 651f946497..bd1ac0e577 100644
--- a/ext/tk/lib/tkextlib/tkimg/sun.rb
+++ b/ext/tk/lib/tkextlib/tkimg/sun.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'sun'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkimg/tga.rb b/ext/tk/lib/tkextlib/tkimg/tga.rb
index 1eae407c0a..1dd499b953 100644
--- a/ext/tk/lib/tkextlib/tkimg/tga.rb
+++ b/ext/tk/lib/tkextlib/tkimg/tga.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'tga'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkimg/tiff.rb b/ext/tk/lib/tkextlib/tkimg/tiff.rb
index ed271c2600..a2d1d8fcc5 100644
--- a/ext/tk/lib/tkextlib/tkimg/tiff.rb
+++ b/ext/tk/lib/tkextlib/tkimg/tiff.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'tiff'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkimg/window.rb b/ext/tk/lib/tkextlib/tkimg/window.rb
index 3b5906fab6..346f246aa4 100644
--- a/ext/tk/lib/tkextlib/tkimg/window.rb
+++ b/ext/tk/lib/tkextlib/tkimg/window.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'window'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkimg/xbm.rb b/ext/tk/lib/tkextlib/tkimg/xbm.rb
index f4bea030be..0a4deffdd7 100644
--- a/ext/tk/lib/tkextlib/tkimg/xbm.rb
+++ b/ext/tk/lib/tkextlib/tkimg/xbm.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'xbm'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkimg/xpm.rb b/ext/tk/lib/tkextlib/tkimg/xpm.rb
index 5119c8710b..7708b9d427 100644
--- a/ext/tk/lib/tkextlib/tkimg/xpm.rb
+++ b/ext/tk/lib/tkextlib/tkimg/xpm.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 #  TkImg - format 'xpm'
 #                               by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)