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The C and C++ Include Header Files

cat -n /usr/include/node/v8-version.h

     1	// Copyright 2015 the V8 project authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style license that can be
     3	// found in the LICENSE file.
     4	
     5	#ifndef V8_INCLUDE_VERSION_H_  // V8_VERSION_H_ conflicts with src/version.h
     6	#define V8_INCLUDE_VERSION_H_
     7	
     8	// These macros define the version number for the current version.
     9	// NOTE these macros are used by some of the tool scripts and the build
    10	// system so their names cannot be changed without changing the scripts.
    11	#define V8_MAJOR_VERSION 12
    12	#define V8_MINOR_VERSION 4
    13	#define V8_BUILD_NUMBER 254
    14	#define V8_PATCH_LEVEL 21
    15	
    16	// Use 1 for candidates and 0 otherwise.
    17	// (Boolean macro values are not supported by all preprocessors.)
    18	#define V8_IS_CANDIDATE_VERSION 0
    19	
    20	#endif  // V8_INCLUDE_VERSION_H_