[xml] MAC OS X - illegal reference to symbol: _crc32

[Utkarsh Shah <ushah wmotion com>]

Hello,
        I am trying to compile libxml as a static library on MAC OS X. 
Using the Xcode I obtained the library(libxml.a). But when I use that 
library I get following error at link time,

ld: /usr/lib/libxml.a(xmlIO.o) illegal reference to symbol: _crc32 
defined in indirectly referenced dynamic library /usr/lib/libz.1.dylib

I just want to use this library to along with libxslt to perform XSLT 
transformations. But I need static libraries for this. Is there some 
flag/Preprocessor Macro that I have to set in Xcode to get rid of this 
error?

-Utkarsh