Apache2 error

["Philippe Dhont (Sea-ro)" <philippe.dhont@searo.be>]

Title: Apache2 error

[emerg] (38)Function not implemented: Couldn't create accept lock

Kernel is 2.6.13.4
Dual xeon proc, 1gb ram

New installation, everything installed with apt-get

I have no idea what it means....
Grtz,
Phil.