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-rw-r--r--tool/m4/ruby_mingw32.m41
1 files changed, 1 insertions, 0 deletions
diff --git a/tool/m4/ruby_mingw32.m4 b/tool/m4/ruby_mingw32.m4
index 70127e3ea9..57b83f26ee 100644
--- a/tool/m4/ruby_mingw32.m4
+++ b/tool/m4/ruby_mingw32.m4
@@ -1,3 +1,4 @@
+# -*- Autoconf -*-
AC_DEFUN([RUBY_MINGW32],
[AS_CASE(["$host_os"],
[cygwin*], [