Did you compile Apache ?
http://httpd.apache.org/docs/2.2/mis...ml#compiletime
Did you read the thing you quoted ?
"If you want to play with fire and disable this feature
you can define NO_LINGCLOSE, but this is not recommended at all".
This means it is not already defined. You actually need to know what you are doing. But according to the creators of the software, you shouldn't do it !