problem to install uclibc on gentoo

[sapirf fersht]

Hello everyone

This is my first post to this list and i hope you will bear with me. I am
trying to install uclibc on gentoo
 Linux carin 2.6.19-gentoo-r5 #1 SMP Sat Mar 10 20:56:45 IST 2007 i686
Intel(R) Pentium(R) M processor 1.60GHz GenuineIntel GNU/Linux

The problem is that it fails with the following error:
ishift 1  tshift 10  size 20560
ishift 2  tshift 10  size 20556
smallest = 3604
setting ishift 5  tshift 2
make: *** [wctables.h] Segmentation fault
make: *** Waiting for unfinished jobs....

!!! ERROR: sys-libs/uclibc-0.9.28.3 failed.
Call stack:
  ebuild.sh, line 1615:   Called dyn_compile
  ebuild.sh, line 972:   Called qa_call 'src_compile'
  ebuild.sh, line 44:   Called src_compile
  uclibc-0.9.28.3.ebuild, line 383:   Called die

!!! make locales failed
!!! If you need support, post the topmost build error, and the call stack if
relevant.
!!! A complete build log is located at '/var/log/portage/sys-libs:
uclibc-0.9.28.3:20070526-090253.log'.


In the begining of the installation it says

^[[33;01m*^[[0m QA Notice: USE Flag 'crosscompile_opts_headers-only' not in
IUSE for sys-libs/uclibc-0.9.28.3
>>> Unpacking source...
>>> Unpacking uClibc-0.9.28.3.tar.bz2 to
/var/tmp/portage/portage/sys-libs/uclibc-0.9.28.3/work
>>> Unpacking uClibc-0.9.28.3-patches-1.0.tar.bz2 to
/var/tmp/portage/portage/sys-libs/uclibc-0.9.28.3/work
 ^[[33;01m*^[[0m You really should consider setting UCLIBC_CPU
 ^[[33;01m*^[[0m Otherwise, the build will be generic (read: slow).
 ^[[33;01m*^[[0m Available CPU options:
GENERIC_386 386 486 586 686 586MMX PENTIUMII PENTIUMIII PENTIUM4 K6 K7 ELAN
CRUSOE WINCHIPC6 WINCHIP2 CYRIXIII

My questions are:
1. how can i install the program?
2. how do i set UCLIBC_CPU or more exactly, in which file this parameter
exist?

Thanks in advance
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