I got this problem with the repostiroy ubuntu 8.04 is offering me.
I used the old 0.5.* version but it is lacking a lot of features..so then I installed the backported nginx version but that is lacking the enable-tlsext.
How can I find out if the old debian ubuntu 8.04 hardy package is using the enable-tlsext option? (but lacking other features) the one at: http://packages.ubuntu.com/hardy/nginx ?