I'm currently working on my own little mod for s**ts and giggles. The mod is a weapon rebalance of Episode 2 and single player only. It's very modest, with most of the changes being stuff like weapon damage, ammo amounts, health, movement speeds, that sort of thing. My programming knowledge peaked in 2001 so I can't really do anything spectacular.

I'd done most of the necessary 'coding' (if you can call changing numbers coding) in the files spat out by 'Create a Mod' under the SDK tools when I realized that none of the EP1 or 2 code was included in the solution. I have the necessary files, npc_zombine.cpp and npc_hunter.h and all that, the rub is that I need to get them into the solution with the rest of the already working code. And that is where I'm completely stuck. I did a fresh install of the source code and got the client part with the Ep2 stuff compiling correctly, but the server part gives compile errors that I cannot make heads or tails of. Here's the truncated build log:

Compiling...
cl : Command line warning D9035 : option 'Wp64' has been deprecated and will be removed in a future release
ai_behavior_passenger.cpp
c:documents and settingsownerdesktopmiscellaneousmodhl2sgsassrcgameserverai_behavior_passenger.h(16) : fatal error C1083: Cannot open include file: 'vehicle_jeep_episodic.h': No such file or directory
npc_alyx_episodic.cpp
c:documents and settingsownerdesktopmiscellaneousmodhl2sgsassrcgameserverhl2npc_playercompanion.h(22) : fatal error C1083: Cannot open include file: 'ai_behavior_passenger_companion.h': No such file or directory
npc_antliongrub.cpp
c:documents and settingsownerdesktopmiscellaneousmodhl2sgsassrcgameserverhl2npc_playercompanion.h(22) : fatal error C1083: Cannot open include file: 'ai_behavior_passenger_companion.h': No such file or directory

[.... same missing ai_behavior_... error repeats for a total of 14 times....]

Build log was saved at "file://c:Documents and SettingsOwnerDesktopMiscellaneousmodhl2sgsassrcgameserverRelease_hl2BuildLog.htm"
Server (HL2) - 15 error(s), 1 warning(s)

I've looked up what that error means and it quite obviously states that the header files that are to be included don't exist. The part I don't get is that these files do exist, and they are sitting in my solution explorer in VSE2008 right where they are supposed to be (at least I think they are). I don't know what to do to fix this. I've googled, scoured the valve developer wiki, read hundreds of posts in the hlcoders mailing list and more to no avail. Any help would be appreciated