How to enable thread safety on postgresql 8.3.6

Hi

I need to enable option --enable-thread-safety after install completed.
Do you have any way for this case. Because I try to remove and reinstall by
enable thread safety.
But not update feature --enable-thread-safety Postgresql config still value
config  in the first install.
Any way sugest to me how to do it.

Thank you
Yo

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