[CMake] LINK : fatal error LNK1104: cannot open file 'z.lib'

[motes motes]

I use cmake to create makefiles for a C++ project. One of the target links
is just called 'z':

TARGET_LINK_LIBRARIES(z  ...

When I try to compile the code (Visual Studio 2008) I get:

LINK : fatal error LNK1104: cannot open file 'z.lib'

I have tried to download zlib for windows and point to the zlib .lib files
from VS 2008 but that is not what it want. What is 'z'?
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