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-rw-r--r--tool/m4/ruby_prepend_option.m41
1 files changed, 1 insertions, 0 deletions
diff --git a/tool/m4/ruby_prepend_option.m4 b/tool/m4/ruby_prepend_option.m4
index c1d28528c5..3e868a6831 100644
--- a/tool/m4/ruby_prepend_option.m4
+++ b/tool/m4/ruby_prepend_option.m4
@@ -1,3 +1,4 @@
+# -*- Autoconf -*-
AC_DEFUN([RUBY_PREPEND_OPTION],
[# RUBY_PREPEND_OPTION($1)
AS_CASE([" [$]{$1-} "],