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-rw-r--r--tool/m4/ruby_check_sizeof.m42
1 files changed, 1 insertions, 1 deletions
diff --git a/tool/m4/ruby_check_sizeof.m4 b/tool/m4/ruby_check_sizeof.m4
index 38d7918f2e..975ac6c9be 100644
--- a/tool/m4/ruby_check_sizeof.m4
+++ b/tool/m4/ruby_check_sizeof.m4
@@ -1,4 +1,4 @@
-# -*- Autoconf -*-
+dnl -*- Autoconf -*-
dnl RUBY_CHECK_SIZEOF [typename], [maybe same size types], [macros], [include]
AC_DEFUN([RUBY_CHECK_SIZEOF],
[dnl