cygwin编译ffmpeg报奇怪连接错误

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我只复制了部分错误。assert()，mmap（）我自己个例子是可以编译过的，这里链接错误，不知道问题出在哪？nm查看.o中的符号是U，未定义，我用gcc 3.4.4，另外我搜索C:\cygwin\usr\include下有两个assert.h，一个在include下，一个在include/mingw下（还有malloc.h等），不知道是不是这个原因。

1. /home/xxx/ffmpeg-0.6/libavcodec/libavcodec.a(ratecontrol.o):ratecontrol.c:(.
   
2. text+0x3217): undefined reference to `___assert_func'
   
3. /home/xxx/ffmpeg-0.6/libswscale/libswscale.a(utils.o):utils.c:(.text+0x509c)
   
4. : undefined reference to `_munmap'
   
5. /home/xxx/ffmpeg-0.6/libswscale/libswscale.a(utils.o):utils.c:(.text+0x50bc)
   
6. : undefined reference to `_munmap'
   
7. /home/xxx/ffmpeg-0.6/libswscale/libswscale.a(utils.o):utils.c:(.text+0x6e7e)
   
8. : undefined reference to `_mmap'
   
9. /home/xxx/ffmpeg-0.6/libswscale/libswscale.a(utils.o):utils.c:(.text+0x6eb8)
   
10. : undefined reference to `_mmap'
    
11. /home/xxx/ffmpeg-0.6/libavutil/libavutil.a(log.o):log.c:(.text+0x184): undef
    
12. ined reference to `___getreent'
    
13. /home/xxx/ffmpeg-0.6/libavutil/libavutil.a(log.o):log.c:(.text+0x1dc): undef
    
14. ined reference to `___getreent'
    
15. /home/xxx/ffmpeg-0.6/libavutil/libavutil.a(log.o):log.c:(.text+0x21c): undef
    
16. ined reference to `___getreent'
    
17. /home/xxx/ffmpeg-0.6/libavutil/libavutil.a(log.o):log.c:(.text+0x247): undef
    
18. ined reference to `___getreent'
    
19. /home/xxx/ffmpeg-0.6/libavutil/libavutil.a(error.o):error.c:(.text+0x40): un
    
20. defined reference to `_strerror_r'
    
21. /home/xxx/ffmpeg-0.6/libavutil/libavutil.a(rational.o):rational.c:(.text+0x8
    
22. 8d): undefined reference to `___fpclassifyd'
    
23. /home/xxx/ffmpeg-0.6/libavutil/libavutil.a(mathematics.o):mathematics.c:(.te
    
24. xt+0x57d): undefined reference to `___assert_func'
    
25. /home/xxx/ffmpeg-0.6/libavutil/libavutil.a(mathematics.o):mathematics.c:(.te
    
26. xt+0x5c6): undefined reference to `___assert_func'
    
27. /home/xxx/ffmpeg-0.6/libavutil/libavutil.a(mathematics.o):mathematics.c:(.te
    
28. xt+0x650): undefined reference to `___assert_func'
    
29. collect2: ld 返回 1
    
30. make: *** [ffplay_g.exe] 错误 1f

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