config won't compile to current

hello
I cvsuped to 5.2.1 -current from 5.2.1. release,and when tried to
compile,config said it needed to be recompiled to fit kernel version. so, I
went to /usr/src/usr.sbin/config, make clean, make..... but then it stopped
saying 
lang.l:1034: warning: `yy_flex_realloc' defined but not used
*** Error code 1

I looked into lang.l file, but there is no yy_flex_realloc even!!!

what am I missing to compile config,and compile my current kernel?

thanks!

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