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-rw-r--r--tool/m4/ruby_check_builtin_func.m42
1 files changed, 1 insertions, 1 deletions
diff --git a/tool/m4/ruby_check_builtin_func.m4 b/tool/m4/ruby_check_builtin_func.m4
index 3fe5caf429..40abc78ef8 100644
--- a/tool/m4/ruby_check_builtin_func.m4
+++ b/tool/m4/ruby_check_builtin_func.m4
@@ -1,4 +1,4 @@
-# -*- Autoconf -*-
+dnl -*- Autoconf -*-
AC_DEFUN([RUBY_CHECK_BUILTIN_FUNC], [dnl
AC_CACHE_CHECK([for $1], AS_TR_SH(rb_cv_builtin_$1),
[AC_LINK_IFELSE(