I give up. I've asked this question some time ago but I'm again into that issue. I'm still stuck with compilation errors / missing files / other stuff that I can't / don't have time to fix. Don't get me wrong - I've compiled it several times, but none of the DLL files I've got worked. I use WAMPServer 2.1e [Apache 2.2.17, PHP 5.3.5] - after enabling php_runkit it does not start. Even already compiled DLLs from the Internet haven't worked. Another time Windows seems to be simply against me.
Now as a programmer I feel really, really lame to ask you the following: can someone compile PHP runkit DLL extension for me or point me to the WORKING one? Please test if it works and provide your WAMP stack configuration, so I can adjust mine.
You would be my hero.