求高手，大侠，下面是我在在网上拷下来的libgen.h文件其中的开头部分，本来是想拿来用在C中的，不知道跟Unix有几毛钱的关系，在visual stdio 2008里面编译时显示下面的第二行的什么usedby的错误。。
具体情况是这样。。菜鸟跪求答案。
1>C:\Program Files\Microsoft Visual Studio 9.0\VC\include\libgen.h(2) : fatal error C1021: 无效的预处理器命令“usedby”
/*ident 识别 "@(#)cls4:incl-master/proto-headers/libgen.h 1.1" */
#usedby svr4 sgi-svr4 solaris
/*******************************************************************************
C++ source for the C++ Language System, Release 3.0. This product
is a new release of the original cfront developed in the computer
science research center of AT&T Bell Laboratories.
Copyright (c) 1991 AT&T and UNIX System Laboratories, Inc.
Copyright (c) 1984, 1989, 1990 AT&T. All Rights Reserved.
THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE of AT&T and UNIX System
Laboratories, Inc. The copyright notice above does not evidence
any actual or intended publication of such source code.
*******************************************************************************/
------解决方案--------------------------------------------------------
Copyright (c) 1991 AT&T and UNIX System Laboratories, Inc.
Copyright (c) 1984, 1989, 1990 AT&T. All Rights Reserved.
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