Okay, I managed to compile this, I had to comment out line 295 in hlsdk-2.3-p4/multiplayer/dlls/player.h since compiler gave me this error and I don't know how to fix it.
Code:
In file included from hldsv8.cpp:4:0:
../hlsdk-2.3-p4/multiplayer/dlls/player.h:295:7: error: extra qualification ‘CBasePlayer::’ on member ‘TabulateAmmo’ [-fpermissive]
I'm not sure did that ruin something but at least I got it compiled ^^
And btw, if someone wants to save time you can just install package libv8-dev:i386 in debian and you don't have to compile v8.