Problems installing pecl memcache

[Ahto ´]

Hi,
 
I tried to install the latest memcache pecl extension but it failed to configure because it could not find the php_session.h file so I made the necessary symlink. I tried to configure it again but it failed with the following error:
 
checking for session includes... /usr/include/phpchecking for memcache session support... enabledconfigure: error:You've configured extension memcache, which depends on extension session,but you've either not enabled session, or have disabled it.
 
I don't know what to do next because session extension is installed and working just fine.
My system is ubuntu and Php version 5.1.2 was installed through apt-get.
 
Did anyone run into the same problem?
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