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-rw-r--r--tool/m4/ruby_try_cflags.m41
1 files changed, 1 insertions, 0 deletions
diff --git a/tool/m4/ruby_try_cflags.m4 b/tool/m4/ruby_try_cflags.m4
index 6756c33109..86ab80e1e6 100644
--- a/tool/m4/ruby_try_cflags.m4
+++ b/tool/m4/ruby_try_cflags.m4
@@ -1,3 +1,4 @@
+# -*- Autoconf -*-
AC_DEFUN([RUBY_TRY_CFLAGS], [
AC_MSG_CHECKING([whether ]$1[ is accepted as CFLAGS])
RUBY_WERROR_FLAG([