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-rw-r--r--tool/m4/ruby_werror_flag.m41
1 files changed, 1 insertions, 0 deletions
diff --git a/tool/m4/ruby_werror_flag.m4 b/tool/m4/ruby_werror_flag.m4
index a8d9e3c5e7..e9155c8309 100644
--- a/tool/m4/ruby_werror_flag.m4
+++ b/tool/m4/ruby_werror_flag.m4
@@ -1,3 +1,4 @@
+# -*- Autoconf -*-
AC_DEFUN([RUBY_WERROR_FLAG], [dnl
save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $rb_cv_warnflags"