@eAnic: you need the metamod source code and the HL SDK to compile it. Check out the Makefile and adapt the paths to suit your installation.
@Austin: yes, Wei "Whistler" Mingzhi's source code is available at
http://planet.time.net.my/TechnologyPark/weimingzhi - after looking it up. There seems to be a lot of cool stuff with it, especially the BotMixer port, which allows you to run the barebones PB 2.5 DLL with CS 1.6, I really wonder why none of us has thought about it yet !! Whistler, you're doing great stuff, make yourself known !