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diff --git a/include/ruby/impl/compiler_is/intel.h b/include/ruby/impl/compiler_is/intel.h
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+#ifndef RUBY3_COMPILER_IS_INTEL_H /*-*-C++-*-vi:se ft=cpp:*/
+#define RUBY3_COMPILER_IS_INTEL_H
+/**
+ * @file
+ * @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 `RUBY3` or `ruby3` 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 #RUBY3_COMPILER_IS_Intel.
+ */
+#if ! defined(__INTEL_COMPILER)
+# define RUBY3_COMPILER_IS_Intel 0
+
+#elif ! defined(__INTEL_COMPILER_UPDATE)
+# define RUBY3_COMPILER_IS_Intel 1
+# /* __INTEL_COMPILER = XXYZ */
+# define RUBY3_COMPILER_VERSION_MAJOR (__INTEL_COMPILER / 100)
+# define RUBY3_COMPILER_VERSION_MINOR (__INTEL_COMPILER % 100 / 10)
+# define RUBY3_COMPILER_VERSION_PATCH (__INTEL_COMPILER % 10)
+
+#else
+# define RUBY3_COMPILER_IS_Intel 1
+# /* __INTEL_COMPILER = XXYZ */
+# define RUBY3_COMPILER_VERSION_MAJOR (__INTEL_COMPILER / 100)
+# define RUBY3_COMPILER_VERSION_MINOR (__INTEL_COMPILER % 100 / 10)
+# define RUBY3_COMPILER_VERSION_PATCH __INTEL_COMPILER_UPDATE
+#endif
+
+#endif /* RUBY3_COMPILER_IS_INTEL_H */