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diff --git a/include/ruby/backward/2/gcc_version_since.h b/include/ruby/backward/2/gcc_version_since.h
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+#ifndef RUBY_BACKWARD2_GCC_VERSION_SINCE_H /*-*-C++-*-vi:se ft=cpp:*/
+#define RUBY_BACKWARD2_GCC_VERSION_SINCE_H
+/**
+ * @author Ruby developers <ruby-core@ruby-lang.org>
+ * @copyright This file is a part of the programming language Ruby.
+ * Permission is hereby granted, to either redistribute and/or
+ * modify this file, provided that the conditions mentioned in the
+ * file COPYING are met. Consult the file for details.
+ * @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
+ * implementation details. Don't take them as canon. They could
+ * rapidly appear then vanish. The name (path) of this header file
+ * is also an implementation detail. Do not expect it to persist
+ * at the place it is now. Developers are free to move it anywhere
+ * anytime at will.
+ * @note To ruby-core: remember that this header can be possibly
+ * recursively included from extension libraries written in C++.
+ * Do not expect for instance `__VA_ARGS__` is always available.
+ * We assume C99 for ruby itself but we don't assume languages of
+ * extension libraries. They could be written in C++98.
+ * @brief Defines old GCC_VERSION_SINCE
+ */
+#include "ruby/internal/compiler_since.h"
+
+#ifndef GCC_VERSION_SINCE
+#define GCC_VERSION_SINCE(x, y, z) RBIMPL_COMPILER_SINCE(GCC, (x), (y), (z))
+#endif
+
+#ifndef GCC_VERSION_BEFORE
+#define GCC_VERSION_BEFORE(x, y, z) \
+ (RBIMPL_COMPILER_BEFORE(GCC, (x), (y), (z)) || \
+ (RBIMPL_COMPILER_IS(GCC) && \
+ ((RBIMPL_COMPILER_VERSION_MAJOR == (x)) && \
+ ((RBIMPL_COMPILER_VERSION_MINOR == (y)) && \
+ (RBIMPL_COMPILER_VERSION_PATCH == (z))))))
+#endif
+
+#endif /* RUBY_BACKWARD2_GCC_VERSION_SINCE_H */