Building nginx with TCP_FASTOPEN enabled

[mastercan]

Hello,

I've tried to use "fastopen" in the listen directive but nginx gave me an
error that the option is unkown.

I'm using nginx 1.7.4 on Debian Wheezy 3.14.13 kernel.

I've compiled nginx myself.
When I run the configure command, I get:
"checking for TCP_FASTOPEN ... not found"

'cat /proc/sys/net/ipv4/tcp_fastopen' gives me "3" - I also tried it with
the value "2".

Why does my system not support TCP fastopen? My kernel is recent enough...

thank you,
Can

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,252447,252447#msg-252447