glibc 2.5.1 make problem

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i have been building my lf with lfs live cd 2160 on virtualbox for 3
days.And I am on cheapter 5.6.
But while i was making glibc 2.5.1 it gave error
the error is:

"nsswitch.c:80: error: `LIBNSS_FILES_SO’ undeclared here (not in a function)
make[2]: *** [/usr/src/gnu/glibc-build/nss/nsswitch.o] Error 1
make[2]: Leaving directory `/usr/src/gnu/glibc-2.5.1/nss’
make[1]: *** [nss/subdir_lib] Error 2
make[1]: Leaving directory `/usr/src/gnu/glibc-2.5.1′  "

i cant solve this problem. Is there anyone who knows how to be solved it?
Thanks for comments.
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