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-rw-r--r--tool/m4/ruby_check_va_copy.m42
1 files changed, 1 insertions, 1 deletions
diff --git a/tool/m4/ruby_check_va_copy.m4 b/tool/m4/ruby_check_va_copy.m4
index 403ef801f2..4672d1852c 100644
--- a/tool/m4/ruby_check_va_copy.m4
+++ b/tool/m4/ruby_check_va_copy.m4
@@ -1,5 +1,5 @@
# -*- Autoconf -*-
-m4_define(RUBY_CHECK_VA_COPY, [
+AC_DEFUN([RUBY_CHECK_VA_COPY], [
if test "x$rb_cv_va_copy" = x; then
AC_TRY_RUN(
[#include <stdlib.h>