My guess is you need build essential installed.

Su to root.

sudo su -

Then installed other foo ...

apt-get update;apt-get install apache2-threaded-dev php5-dev php-pear;pecl install apc

Hit enter(Y)

Then hit enter again.

Then install the php pecl thingy ....

echo "extension=apc.so" >> /etc/php5/apache2/php.ini

Then restart apache2

 

/etc/init.d/apache2 restart

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