ssl_prefer_server_ciphers unknown directive

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http://serverfault.com – I just compiled nginx v1.2.3 from source on a CentOS 6.3 server and am trying to use the ssl_prefer_server_ciphers directive, but I am getting an error nginx: [emerg] unknown directive "ssl_prefer_serfver_cipers" in /etc/nginx/sites-enabled/application:5 I am not seeing anywhere that this directive depends on any specific versions of other libraries, or even specific versions of nginx. What could I be doing wrong here? (HowTos)