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1.Install autoconf:
apt-get install autoconf
2.Install APC using PECL:
pecl install apc
3.After install process we have messages like this:
Build process completed successfully Installing '/usr/local/lib/php/extensions/no-debug-non-zts-20060613/apc.so' install ok: channel://pecl.php.net/APC-3.0.19 configuration option "php_ini" is not set to php.ini location You should add "extension=apc.so" to php.ini