how can i force squid to use included GNUregex ?

I was trying to compile squid with included GNUregex, but i can't find any
./configure option to do that ...

Where is that option ? (USE_GNUREGEX), that ChangeLog talks about ...

...
>Changes to squid-1.1.4 (January 13, 1997):
>
> - Created USE_GNUREGEX define to fix forcing GNU regex on
> Solaris and NeXTStep.

How can i enable that ?

Tks.

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