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-rw-r--r--tool/m4/ruby_stack_grow_direction.m41
1 files changed, 1 insertions, 0 deletions
diff --git a/tool/m4/ruby_stack_grow_direction.m4 b/tool/m4/ruby_stack_grow_direction.m4
index f8bbc3b6dc..e930bc62ec 100644
--- a/tool/m4/ruby_stack_grow_direction.m4
+++ b/tool/m4/ruby_stack_grow_direction.m4
@@ -1,3 +1,4 @@
+# -*- Autoconf -*-
AC_DEFUN([RUBY_STACK_GROW_DIRECTION], [
AS_VAR_PUSHDEF([stack_grow_dir], [rb_cv_stack_grow_dir_$1])
AC_CACHE_CHECK(stack growing direction on $1, stack_grow_dir, [