升级kdelibs-3.2.1时，编译有警告？？

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2. /usr/include/sys/cdefs.h:273: warning: `_POSIX_C_SOURCE' is not defined
   
3. /usr/include/sys/cdefs.h:279: warning: `_POSIX_C_SOURCE' is not defined
   

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那个头文件我没改动过的。。
这是那个头文件：

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2. 265   * In addition, the X/Open Portability Guide, which is now the Single UNIX
   
3.    266   * Specification, defines a feature-test macro which indicates the version of
   
4.    267   * that specification, and which subsumes _POSIX_C_SOURCE.
   
5.    268   *
   
6.    269   * Our macros begin with two underscores to avoid namespace screwage.
   
7.    270   */
   
8.    271
   
9.    272  /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
   
10.    273  #if _POSIX_C_SOURCE == 1
    
11.    274  #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
    
12.    275  #define _POSIX_C_SOURCE         199009
    
13.    276  #endif
    
14.    277
    
15.    278  /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
    
16.    279  #if _POSIX_C_SOURCE == 2
    
17.    280  #undef _POSIX_C_SOURCE
    
18.    281  #define _POSIX_C_SOURCE         199209
    
19.    282  #endif
    

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这里已经定义了阿？？

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2.      1  /usr/include/sys/cdefs.h:#define        _POSIX_C_SOURCE         199009
   
3.      2  /usr/include/sys/cdefs.h:#define        _POSIX_C_SOURCE         199209
   
4.      3  /usr/include/sys/cdefs.h:#define        _POSIX_C_SOURCE         200112
   
5.      4  /usr/include/sys/cdefs.h:#define        _POSIX_C_SOURCE         199506
   
6.      5  /usr/include/sys/cdefs.h:#if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
   
7.      6  /usr/include/sys/cdefs.h:#define        _POSIX_C_SOURCE         198808
   
8.      7  /usr/include/sys/mount.h:#if !defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE)
   
9.      8  /usr/include/sys/_posix.h:#if (!defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)) || \
   
10.      9  /usr/include/sys/_posix.h: (_POSIX_VERSION  >= 199309L && defined(_POSIX_C_SOURCE) && \
    

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system is FreeBSD

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