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-rw-r--r--tool/m4/ruby_setjmp_type.m41
1 files changed, 1 insertions, 0 deletions
diff --git a/tool/m4/ruby_setjmp_type.m4 b/tool/m4/ruby_setjmp_type.m4
index 2550fdcf4c..e054a544c5 100644
--- a/tool/m4/ruby_setjmp_type.m4
+++ b/tool/m4/ruby_setjmp_type.m4
@@ -1,3 +1,4 @@
+# -*- Autoconf -*-
AC_DEFUN([RUBY_SETJMP_TYPE], [
RUBY_CHECK_BUILTIN_SETJMP
RUBY_CHECK_SETJMP(_setjmpex, [], [@%:@include <setjmpex.h>])