memcache.so, wrong architecture in Unknown on line 0 in MAMP-Collection of common programming errors

I install memcache from pecl and I got memcache.so. After that I add in php.ini but I got a error.

[12-Aug-2010 13:02:24] PHP Warning: PHP Startup: Unable to load dynamic library ‘/Applications/MAMP/bin/php5.3/lib/php/extensions/no-debug-non-zts-20090626/memcache.so’ – dlopen(/Applications/MAMP/bin/php5.3/lib/php/extensions/no-debug-non-zts-20090626/memcache.so, 9): no suitable image found. Did find: /Applications/MAMP/bin/php5.3/lib/php/extensions/no-debug-non-zts-20090626/memcache.so: mach-o, but wrong architecture in Unknown on line 0

I tried

$file /Applications/MAMP/bin/php5.3/lib/php/extensions/no-debug-non-zts-20090626/memcache.so

I got

/Applications/MAMP/bin/php5.3/lib/php/extensions/no-debug-non-zts-20090626/memcache.so: Mach-O 64-bit bundle x86_64

I’m using Mac OS x 10.6.4 64bits