Thread safety -- how to disable?

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Can anyone tell me what controls php's "thread safety" feature?

I have an installation where phpinfo() is showing Thread safety: enabled,  
whereas I need it disabled in order to work with

So far as I can tell, the options I used to configure php did not ask for  
thread-safety, and I also don't see any options to *dis*able thread-safety.  
Configure --help does show several threading-related options, but none for  

FWIW, here are some tech details:

php 5.2.0
configure command options used (as reported by phpinfo()):
'./configure' '--prefix=/usr/local/php5'  
'--with-apxs2=/usr/local/apache2/bin/apxs' '--with-mysql=/usr/'  
'--with-mysqli=/usr/bin/mysql_config' '--with-zlib' '--with-gd'  
'--enable-mbstring' '--with-libmbfl'



Graham Wideman
Visio 2003 Developer's Survival Pack
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