Problem compiling with VC6

[Feanaro]

I have another problem :

Compiling...
client.cpp
console.cpp
LoginServer.cpp
net.cpp
zoneserver.cpp
classes.cpp
database.cpp
EMuShareMem.cpp
EQNetwork.cpp
eqtime.cpp
MiscFunctions.cpp
moremath.cpp
Mutex.cpp
packet_dump.cpp
packet_dump_file.cpp
packet_functions.cpp
C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\zlib.h(171) : error C2143: syntax error : missing ';' before 'const'
C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\zlib.h(171) : error C2501: 'ZEXTERN' : missing storage-class or type specifiers
C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\zlib.h(201) : error C2144: syntax error : missing ';' before type 'int'
C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\zlib.h(201) : error C2501: 'ZEXTERN' : missing storage-class or type specifiers
C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\zlib.h(201) : error C2086: 'ZEXTERN' : redefinition
C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\zlib.h(201) : fatal error C1004: unexpected end of file found
races.cpp
serverinfo.cpp
TCPConnection.cpp
timer.cpp
Error executing cl.exe.

World.exe - 6 error(s), 0 warning(s)

Who knows, whats that ??