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-rw-r--r--tool/generic_erb.rb4
1 files changed, 4 insertions, 0 deletions
diff --git a/tool/generic_erb.rb b/tool/generic_erb.rb
index 5d44738297..0664056651 100644
--- a/tool/generic_erb.rb
+++ b/tool/generic_erb.rb
@@ -1,4 +1,8 @@
# -*- coding: us-ascii -*-
+
+# Used to expand Ruby template files by common.mk, uncommon.mk and
+# some Ruby extension libraries.
+
require 'erb'
require 'optparse'
require 'fileutils'