Compile errors in VC++ 6.0

[tcsmyworld]

Previous versions have compiled with no problems, but this new release returns a handful of errors and I can't figure out what I'm missing.
Here's a listing of the errors, any help would be appreciated.

errors in zone-

C:\Program Files\Microsoft Visual Studio\EqEmu050\Zone\attack.cpp(142) : error C2065: 'DEBUG' : undeclared identifier
C:\Program Files\Microsoft Visual Studio\EqEmu050\Zone\client.cpp(7316) : error C2065: 'DEBUG' : undeclared identifier
C:\Program Files\Microsoft Visual Studio\EqEmu050\Zone\client_process.cpp(32 : error C2065: 'DEBUG' : undeclared identifier
C:\Program Files\Microsoft Visual Studio\EqEmu050\Zone\client_process.cpp(5910) : error C2371: 'i' : redefinition; different basic types
C:\Program Files\Microsoft Visual Studio\EqEmu050\Zone\client_process.cpp(5900) : see declaration of 'i'
C:\Program Files\Microsoft Visual Studio\EqEmu050\Zone\MobAI.cpp(307) : error C2065: 'DEBUG' : undeclared identifier
C:\Program Files\Microsoft Visual Studio\EqEmu050\Zone\parser.cpp(57) : error C2039: 'clear' : is not a member of 'basic_string<char,struct std::char_traits<char>,class std::allocator<char> >'
C:\Program Files\Microsoft Visual Studio\EqEmu050\Zone\parser.cpp(94) : error C2228: left of '.base' must have class/struct/union type
C:\Program Files\Microsoft Visual Studio\EqEmu050\Zone\spells.cpp(48 : error C2065: 'DEBUG' : undeclared identifier


29 errors for 'clear' lines-57,71,114,152,169,172,255,542,925,937,986,1037,107 0,1264,1274,1275,1276,1277,1365,1366,1375,1376,
1386,1392,1393,1394,1400,1443,1459 all in parser.cpp

4 errors for '.base' lines- 94,98,102,106 all in parser.cpp


error in EMuShareMem-


C:\Program Files\Microsoft Visual Studio\EqEmu050\EMuShareMem\NPCFactionLists.cpp(55 ) : error C2065: 'DEBUG' : undeclared identifier