[CentOS] zlib error

Hiya, just trying to install a game (warsow).

Error received while running is " error while loading shared libraries:
libz.so.1: cannot open shared object file: No such file or directory"

ldd wsw_server
        linux-gate.so.1 =>  (0xffffe000)
        libdl.so.2 => /lib/libdl.so.2 (0xf7ff2000)
        libm.so.6 => /lib/tls/libm.so.6 (0xf7fcf000)
        libc.so.6 => /lib/tls/libc.so.6 (0x004d6000)
        /lib/ld-linux.so.2 (0x004bd000)
        libz.so.1 => not found

locate libz.so.1
/usr/lib64/libz.so.1
/usr/lib64/libz.so.1.2.1.2

Linux version 2.6.9-11.ELsmp (buildcentos at x8664-build) (gcc version
3.4.320050227 (Red Hat
3.4.3-22)) (dual xeon)

Think I'm missing something obvious (tried the export LD_LIBRARY_PATH to
force it as well but no difference).

Any help greatly appreciated.

Ian
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