[求助] gcc4 应该如何安装 glibc

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我遇到这样的错误：

1. 
   
2. ../sysdeps/ieee754/dbl-64/s_isinf.c:29: error: 'isinf' aliased to undefined symbol '__isinf'
   
3. make[2]: *** [/mnt/lfs/sources/glibc-build/math/s_isinf.os] Error 1
   
4. make[2]: Leaving directory `/mnt/lfs/sources/glibc-2.3.5/math'
   
5. make[1]: *** [math/subdir_lib] Error 2
   
6. make[1]: Leaving directory `/mnt/lfs/sources/glibc-2.3.5'
   
7. make: *** [all] Error 2
   
8. -bash-3.00$
   

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文件内容：

1. /*
   
2. * Written by J.T. Conklin <jtc@netbsd.org>.
   
3. * Changed to return -1 for -Inf by Ulrich Drepper <drepper@cygnus.com>.
   
4. * Public domain.
   
5. */
   
6. 
   
7. #if defined(LIBM_SCCS) && !defined(lint)
   
8. static char rcsid[] = "$NetBSD: s_isinf.c,v 1.3 1995/05/11 23:20:14 jtc Exp $";
   
9. #endif
   
10. 
    
11. /*
    
12. * isinf(x) returns 1 is x is inf, -1 if x is -inf, else 0;
    
13. * no branching!
    
14. */
    
15. 
    
16. #include "math.h"
    
17. #include "math_private.h"
    
18. 
    
19. int
    
20. __isinf (double x)
    
21. {
    
22.         int32_t hx,lx;
    
23.         EXTRACT_WORDS(hx,lx,x);
    
24.         lx |= (hx & 0x7fffffff) ^ 0x7ff00000;
    
25.         lx |= -lx;
    
26.         return ~(lx >> 31) & (hx >> 30);
    
27. }
    
28. hidden_def (__isinf)
    
29. weak_alias (__isinf, isinf)
    
30. #ifdef NO_LONG_DOUBLE
    
31. strong_alias (__isinf, __isinfl)
    
32. weak_alias (__isinf, isinfl)
    
33. #endif

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弥敦路九号

是不是编译时得加上 -lm